Christmas break in London - hotel suggestions?

[spud989]

Looking to stay for 2/3 nights in central ish London just before Christmas (20th) as a little break. I've visited maybe a dozen times before and seen most major sites, but the missus hasn't and wants to do the usual - shopping, some museums , a show, etc.

Anyone got any suggestions of centrally located hotels which are decent? Budget up to 100 per night for the hotel stay, approximately.

[spud989]

Used last minute before, but never the secret option. Is there a catch? Are a few of them duff?