I can't say enough good things about this place. The location is central and very nice and quiet. The room is the perfect size for one person and is immaculately clean. I was surprised by how many snacks and drinks were waiting for me, as well. I thought the bed was comfortable and there's a ton of light which is awesome. Wish I had stayed longer.
Tips and Tricks:
-the stairs are a bit of a climb. Please consider if you are considerably out of shape or have a lot of luggage.
-I found it easiest to use Pimlico tube station. It's super close and is an easy walk down Belgrave road. Much closer than walking to Victoria every time.
-the street sign for Gloucester is a little hidden. Once you find it it's super easy from then on.