Gillian was a fantastic host! Extremely responsive leading up to our trip and completely welcoming and helpful when we arrived. She even had a printed guide with helpful information about the flat, the neighborhood, transit around London - everything we could have asked for and more!
The only thing I'd note is that the building's elevator is a bit dodgy, so the trek up 5 flights of stairs can be a little annoying (or maybe just a good workout).
The flat is perfectly located, a great jumping-off point for exploring southwest London, especially the Chelsea/Hyde Park area. An excellent stay all around.