Hi there,
Firstly, there is a designated forum for Disneyland Paris on Trip Advisor where people who know DLP very well can answer any questions you have about resort and trip planning.
www.tripadvisor.co.uk/ShowForum-g2079053-i21935-Disneyland_Paris_Marne_la_Vallee_Seine_et_Marne_Ile_de_France.html
Also see the Marne La Vallee forum which also covers Disneyland. The two forums are linked but the Top Questions lists are not the same.
The Disneyland Hotel is very convenient especially in the colder months as built over the DL Park entrance, but it is the most expensive. The New York is the next closest to the Village and parks - about 7 mins to the parks entrances walking through the Village and past Chessy railway station. The HNY is also very close to Cafe Mickey, a popular Character Dining restaurant.
I have written two detailed reviews of the HNY which should help. The theming of this hotel is quite adult being 1930's Art Deco, and the indoor pool is deep so not as child friendly as some of the other hotels.
You will find the link for my earlier review underneath this newer one.
www.tripadvisor.co.uk/ShowUserReviews-g226865-d262678-r119909114-Disney_s_Hotel_New_York-Marne_la_Vallee_Seine_et_Marne_Ile_de_France.html
How long you may need there to do and see all that you want can depend on when you go and crowd levels. You will get less done during school holidays and weekends in one day than in term time when parks are not as busy. It can be the difference between walking straight onto rides or just a short wait, or anything up to 2 hrs for some at peak times. This also applies to the length of queues for meeting Characters in the parks, or the Princesses in the new Princess Pavilion in Fantasyland which opened in October.
For me, the minimum is 3 days there, with one day in each park and a 3rd day for doing favourite things again or things we did not have time for. The Studios usually closes earlier than the main park, and some theatre shows here last 40 - 45 mins. You also have to consider time for watching parades in both parks, including some waiting time to get a prime position along the route if you want kids to have a good view.
I like 5 days there - Monday - Friday, and we usually catch the train into Paris for sightseeing on Wednesday. When our boys were young sometimes we spent a week there in July / August, so they had time for swimming every afternoon for a few hours away from the busy park.
I went for 3 days at the beginning of October with my hubby for the start of Halloween Festival and the parks were not busy on Monday - Weds. We flew to Orly and I booked a recommended private company for transfers. I booked directly with Disney and it was £100 cheaper for 3 nts flying Sunday evening, than 2 nts flying Monday morning, with a 40% off hotel, tickets, transport offer.
Next year is going to be very popular with the 20th Anniversary, so we may not get as good offers as last year on the Disney UK site. One offer for 30% off hotel / tickets / transport ended on 28th November. Some people prefer to book flights or Eurostar separately and book the hotel / tickets with Disney, Expedia, Booking.com, or other resort hotel agents.
It is worth checking prices for different arrival dates and also a few different hotels. I usually phone Disney and check a few at the same time.
08448 008 111
Some people book a cheaper hotel without park tickets or a hotel near the airport for arrival night if they have a late flight, and transfer to their Disney hotel with park tickets included the next morning, so they are not wasting a day's ticket.
Hotel Elysee in Val D'Europe is indeed a Disney Associated hotel, and guests staying here do have Extra Magic Hours. There is a free shuttle bus but this begins running later than the Disney hotels buses, so you need to catch the RER line A train for EMH which is usually 8am - 10am in the main park. As you have been before and stayed in the NBC you will probably remember this.
The Sequoia Lodge situated between NBC and HNY on the long side of Lake Disney is a cheaper option and only a couple of mins longer walk than the HNY to the parks.
Rooms here are currently being refurbished with a new Bambi theming. Lodge rooms are finished, but not the main building. Work has currently stopped during Christmas Season and will recommence after 8th January.
The NBC is the next hotel to be refurbished - I think they have already started redecorating the hotel restaurants.
There are 4 options for transfers to/ from Disney and CDG airport -
RER train which is cheapest but takes a long time and you have to change trains in Paris.
Fast TGV train which takes 10 mins but you have to consider other factors, and it is not always as simple as it sounds. You then have to get to your hotel from Chessy station.
VEA bus is the official Disney transport, but again is not always the most convenient or cheapest option.
Private door to door transfer is recommended for families with young children, luggage, buggies etc, booking one of the companies used by people on the TA DLP / MLV forums who are known to be reliable. You do NOT pay in advance. One way varies from ? 60 - ? 70 for up to 6 people.
Trip planning for DLP is a huge subject, but friendly posters on the TA forums can help make your holiday more successful.