Overall had an ok stay. On arrival I was made to give a credit card to cover "extras" which I wasn't planning to use. My room was in a secondary building around the corner away from the main hotel which was a little odd.
The room itself was small but comfortable, all their double rooms are marketed as "deluxe" apparently, and the sound proofing was non-existant. my room (310) was apparently under the stairs which creaked a lot and I was woken up several times in the night by that and doors slamming.
I asked to move room after the first night and was moved to a club room which was slightly bigger and further from the stairs which meant I slept much better.
The staff were very helpful when I asked to move (though they didn't seem at all surprised) and even moved my bags while I was out during the day.
Overall given the cost for a central London hotel, it balances out to pretty average; not great, not awful.