We stayed for 3 nights in Siam’s flat. Marylebone is a great area ( the High Street is 10 minute walk) and the apartment is very close to the Tube station.
Sian responded promptly to my questions leading up to our stay ( we didn’t have any once we were there) and let us drop our bags off early.
The apartment is small but decently equipped. There are a few things that need attention that we’re a bit annoying ( missing lights, mirrors, and curtains that we needed to open and close every day not in working order). We did use the sofa bed which is not all comfortable.