Great location for exploring London
We stayed here the week between Christmas and New Years. The room (king studio, I think) was quite large; the bathroom was large, too, with a tub + wand and a separate shower stall. The concierge was extremely helpful in identifying places to eat/drink, and recommending transport back to the airport.
The location, just 1 minute walk from Victoria station, made it very easy to get just about anywhere we wanted via Underground, and even a few places (especially south of the Thames) by bus. On top of that, it was also very walkable to Westminster and South Kensington (V & A and other museums).
There are numerous restaurants and pubs in the neighborhood, plus a Sainsbury's a block away.
There's some fitness equipment in the lowest basement level, which we didn't use, but we did enjoy the saunas (both wet *and* dry) there.