They can be slightly economical with the truth about locations. I have booked two - one was described as "opposite Canary Wharf". It was in Rotherhithe on the south side of river - a 10 minute walk and a boat ride from Canary Wharf. The other was described as "near Westminster" but was close to lambeth station on the south bank of the river. Both were nice hotels but a lot more hassle to get to than expected.
I booked a secret hotel in. London and managed to work out which one it was. It was a perfect location for us and a bargain too. I wouldn't risk it otherwise.