We stayed at the Princess Hotel on the highest floor. Unfortunately the shared bathroom up there is very, very small and the shower curtain was a bit mouldy. At least there is a sink in the hotel room, so you do not have to go to the bathroom that often. The room was very small and equipped with old furniture, but it was clean. Our towels have not been changed in our three nights and the room was tidied up just once, although we have not been there for the whole day. Since we stayed there in late summer, the room was very hot and we were not able to sleep without opening the window. The location is very central at the in King's Cross Station, that connects many tube lines. That was the biggest advantage.
Unfortunately our actual room was very different from the pictures in the offer.
The room was okay for our short sightseeing trip to London because we did not plan to spend too much time in our room.