My daughter and I stayed in the flat for one week. The place is as described with a shared bathroom on the floor. We were in #2 and had 2 other rooms on this floor. We never had an issue getting into the bathroom to use but as a reminder bring flip-flops for the shower as you do share a shower with others.
A bottle of wine was left for our arrival along with a few other items like breakfast cereal and snacks. This was very nice.
The flat is walking distance to Victoria station, even with my bad knee I could walk it in 10 minutes. Nice restaurants, grocery store 3 minute walk.