Victoria flat is also a basement, steep steps a bit dodgy on exit if you're getting on a bit/somewhat jelly legged like me after a sess!
No ensuites as I recall in either of rooms/1 bathroom in corridor, have experienced the usual "Rix Farce" scenario of being hidden in there while others departed couple of times
Went to Pimlico 3+ yrs ago, was entertained by the lovely Chloe, not sure if they're still in same flat, that had an ensuite and room was a reas. size with mirrors etc but they may have moved since then
W Ken can't comment as not been there, agree abt Maida Vale, bit of a tip compared to other locations, saw Honey there a few times, think the shower was an over bath job, shared it with her a couple of times I recall.
The Sth Ken place was the best but pres the neighbours got the hump or something?