I stayed here for one night on a business trip. I stay at hotels and apartment hotels in London frequently for work and I will definitely stay here again. A major plus point for me is the fact that there is a kitchen area in each room with a microwave, fridge and nespresso machine. This meant that I could make a quick trip to M&S and had everything I needed for dinner and breakfast without having to get room service / go down to the restaurant.
I was upgraded to an executive suite which was great. The lighting was easy to control (often a gripe I have with hotel rooms), as was big TV etc. The suite was nicely laid out, the shower was excellent and the bed was comfy.
The main downside was that the pool/sauna/steam room closed at 9pm which seems very early - I saw lots of disapointed people. It meant I could only swim for 30 mins by the time I had finished work and checked in.