Bonjour Tristesse is a good book - would recommend!
Yep I'm at Newnham, and it is all-female. There are two others, Murray Edwards, and Lucy Cavendish, though the latter is a mature college. Both Clare and Selwyn (and well, most colleges) are very lovely. Careful on accommodation - if you're looking at being close to Sidgwick site, which is where lectures and classes are held, Selwyn is better. With Clare, they have accommodation all over the city, most second years move to the Colony which is a group of houses the other side of town. Definitely get to an open day if you can.
Okay, so questions:
1) What's asked in interviews vary by college, interviewer and year so I can't help you there really. You'll have a test at interview, more info here:
http://www.mml.cam.ac.uk/applying/how#written2)The course is predominantly focussed on literature, yes (I'm not gonna go into too much detail here because time and you can find the info on the website). In your first year, time on language vs literature is about 60:40, and by final year is more like 30:70 (ish, not accurate but more or less to give you an idea). You don't get any choices in papers in your first year. Each language will have its own paper 1 for lit - so FR1 for French. Depending on language, this may contain a linguistics element. You'll be taught for all parts of the paper though you don't actually answer on all parts/texts in the exam so you can focus on what you prefer. Once you move into second year, there are opportunities to pick up a third language, or linguistics papers. In final year, you can borrow papers from other subjects. Check out paper choices here: (IA = 1st year, IB = 2nd, II = 4th; scheduled = not language papers, and all language papers are compulsory)
http://www.mml.cam.ac.uk/part-ii-borrowed-papers and
http://www.mml.cam.ac.uk/mml/ii 3) Read what you want to, and what you enjoy and are happy to talk about. I mentioned like 2/3 I think, though it was a while back. Do not put anything down you haven't read or don't feel like you could talk about if you had to. They also don't have to be majorly famous or scholarly - explore your own interests.
4) Nope I'm spending my year in Spain only.
Also check out applytocambridge.com - alternative prospectus written by the students, and our accounts on twitter @cambtweetcusu (general) @cambtweetmml and @cambtweetabroad (me!).