Absolutely excellent for being in central London, amazing soundproofing, like, really, the only noises I heard was from people outside going into their rooms or talking in the hallway. We were on the third floor and heard NOTHING of the outside London traffic. It really was excellent.
Our issue was relevent for our room, and does not reflect the rest of the rooms.
My wife and I found small patches of blood on our sheets and pillow. It was quite uncomfortable, honestly. We had to throw a towel over it to cover it up while sleeping.
Second, we booked the queen room and it's just.. very small for two people. The distance between the bed and the bathroom is next to nothing. The person sleeping on the right needs to disturb the person sleeping on the left to be able to use the bathroom at night. This wasn't great as a light sleeper.
The shower itself is only height adjustable, and while it can be removed, you can't actually adjust the head of the shower. Someone also took our sleeping sign, we reported it to the front desk, who explained another would be replaced.. we never got another one.