I had a great stay at William's studio.
The area - Well connected to everything one would need. Metro station is 1 min away, District line will connect you to most hot spots in London. There are many shops (closest one is a grocery shop right across the street), even nonstop and restaurants in a couple of mins walking distance. As a solo woman traveling I felt very safe and welcomed in the neighborhood.
The place - More spacious than it seems in the photos. There's a nice patio where you can chill, there are plenty of amenities and a well equipped kitchen. Bed is super comfy, the mattress will set you up for a good night's sleep after you roamed around the city. Shower worked fine, although not as much water pressure.
Check-in - Could have been more smooth. I had to wait for half an hour until access was granted through the main gate. After that, everything went well and keys were provided.
Communication - Great! Sabine, William and Laura were very prompt to respond at any hour!