I too would recommend the Brit Guide. Great read, well written, lots of useful info e.g. numbers of rooms in each hotel to give you an idea of their size and how crowded the breakfasts might be
I would not, however, rec. the 'Unofficial guide to DLP' unless you want to feel thoroughly depressed and panic about why you booked! (If I hadn't been twice before I think I would have cancelled after starting to read this book - I still haven't been brave enough to finish it!) There is also some inaccurate/wrong info in the latest edition.