I was in Lyddon last year, few words of advice:
1) pray you get a big room. They vary massively in size I was in a medium size one with wash basin but the other ones on my part of the corridor were massive, and if you get REALLY lucky and get the top floor of the main hall they come with double beds (I think).
2) don't let the warden bully you. We had some problems last year with the food and state of kitchens as they are very demanding on how clean they should be kept and aren't afraid to lock them. This was our biggest issue last year and after much battling we got them relaxed a bit. you will find the same that in freshers week they don't care then probably the monday they will lock most of them because they are messy we bitched and moaned and in the end we were allowed to do the washing up the next day before midday. But they are right cocks about it.
3) get the subwardens battered. They are like us and when drunk don't care but when sober certain ones can be dicks i'm sure you'll find that out.
4) Food aint brilliant, be prepared to order in, Luckys' or Flames are good and cheap and know where lyddon hall is.
5) there is limited fridge space, middle floor has 2 kitchens to some 20 odd rooms and only 2 standard fridges so if you have your own small one thats good to bring up.
Thats about it really without scaring you guys too much. I had a great time there and it's the people not the food / subwardens which make it! And the showers are actually quite nice there unlike other residences