A good no-frills type place. It is relatively close to Pimlico Station which will get you anywhere you need to get to. The bus system also runs right by the Flat. The room was nice and very clean. There aren't many amenities but that's okay because what they did have was nice. The water got very HOT in the shower which is great. I will agree that the walls were thin, but we didn't have any issues.
Also, it is made perfectly clear that you will be charged a fee for a second bed if you are only two people so I am not complaining about it being a surprise - it wasn't; but, I still think that it is a nickel-and-dime technique considering the name of the Room is "Double Room with a Sofa." Just be prepared to pay extra for that.
Other than that, the place was nice. It was what we needed and expected after a long day of walking around London.