Clémence was extremely helpful, gave us clear instructions, and had a beautiful place prepared for our stay. Probably the only downside was the price but I assume it was due to the date we chose (New Year's Eve and a couple of days before and after).
Besides that, the place was fantastically located, right next to a bus stop that could take you downtown. The place was clean and operative, bigger than we thought.
If you're staying, just take into consideration keeping it quiet since the building is not new and the floor makes some noise, which could be disturbing for your neighbors. Also recommended to take out your shoes (I think this is a valid recommendation for your next guests)
I would stay there again the next time I visit London