A few Caius (and Cambridge)-specific things that may be useful (some answering later questions on this thread):
As all 1st years live at Harvey Court/Stephen Hawking Building and the two share bike storage space, you should be able to leave a bike before moving in, as long as you let the porters know. We popped in before moving-in date and there were plenty of bikes left over the holidays by students who would clearly not be there the next year or had not yet moved in, possibly.
Harvey Court appears to be the more desirable option for accommodation due to having balconies which are used as social spaces, while Stephen Hawking is quieter and more "hotel-like". One can state a preference and about half of all 1st years end up in the one and the rest in the other building. There is a nice café in Harvey Court. Both buildings offer storage space over the Christmas and Easter holidays. It consists of lock-up cupboards in the room, so bulky items like duvets, pillows, monitors etc do not need to be taken home. There is a continuous rental option in Harvey Court only, I think.
There is no charge for using kitchens (some colleges charge depending on the selected meal plan), due to the mandatory meal requirement. Kitchens are tiny, there is no shared seating space and only have fridges, hob, microwave, toaster, kettle. The idea is that most students eat in hall most of the time. The cost is around £5 per meal. Dinner is 3-course with two seatings - an earlier more casual one, "cafeteria" and a later "formal" one for which gowns must be worn. Most other colleges do not have a daily formal.
The gown can be collected on moving-in day and the cost gets added to the bill for the first term. Most freshers did this including DC. Most things get paid this way, including tuition fee, mandatory dining requirement cost etc. (termly in advance). Any other costs arising during the term get added to the bill for the following term.
Do ask away if you need to know anything else.