Thanks for the info about fast track queue at the Eiffel Tower for disabled visitors, I had not heard about that.
You can buy tickets for the ET online on their website ( to the 2nd floor or summit ) to avoid a queue.
Apart from the Hop On / Off Batobus which stops near main sights on a continual loop all day, you can also use HOHO buses, which are double deckers with open top. These also stop at the main sights.
Tour boats on the Seine with commentary in English have a one hour round trip, starting from the quay near the Eiffel Tower, or at Pont Neuf near Notre Dame. You just catch the next boat and pay at the time. You don't have to pre book.
There is no lift up to the Towers of Notre Dame, but there is one for Arc De Triomphe, and a very fast one to the top of Montparnasse Tower for great views.
Paris is more accessable for wheelchairs than other cities/ towns with narrow cobbled streets. Notre Dame area / Ile Saint Louis is a very nice and central part of Paris to stay in.
My mother used a wheelchair as she could not walk very far, and we had a lovely holiday at Lake Garda, as she could manage to walk on/ off the boats and fast hydrofoil gangplanks, so we could visit many of the small towns around the lake, including going up in the cable car at Malcesine.
We stayed in a lovely hotel in Sirmione, where the staff were wonderful, with fab views of the lake and a lovely pool. It was not far pushing her in the wheelchair to catch the boats each day, and Sirmione itself is very pretty.
We stayed in the Hotel Continental. ( I posted a review and photos on Trip Advisor ).
People on the Trip Advisor Paris forum can help with advice for people with disabilities, so worth having a look there.