In summary, Gabriele's flat is cosy, well equipped, and in a perfect location. He is the best airbnb host ever!
Location is perfect. The flat is less than a 5-minute walk to the South Kensington tube stop, which has the Circle, District and Piccadilly lines. You can go all over London really easily. There are a lot of restaurants and shop within a few minutes walk, as well as the V&A Museum, the Kensington Gardens, the natural History Museum, and more. The flat is quiet even in the midst of all this.
The flat is a basement, but there are big windows so there is plenty of light. The skylight in the kitchen had us checking more than once to see if we had left the lights on. The beds are very comfortable, and it is nice that there is a separate half bath in the back bedroom. The kitchen is small but well equipped. We only ate breakfasts in the flat, but it would be possible to cook meals if that is your choice. There is a coffee maker that Gabriele is very proud of, but we couldn't figure out how to make it work. (Gabriele tried hard to get us to fiddle with it, even sending us a video of how to work it, but it seemed easier to drink some of the tea that was also provided.) There is a washer/dryer that we found very nice to have so we could wash clothes halfway through the week.
As a host, Gabriele can't be beat. We arrived early morning from the airport, and his friend was there to greet us and let us in early, which was possible because the flat was not booked the previous day. We found a refrigerator stocked with yogurt, fruit, eggs, butter, milk, and bread (all high quality organic). Gabriele checked in with us several times by text and email to make sure we were enjoying the flat and that everything was working. There is a notebook with recommendations for restaurants and places to go. All in all, this was a great place from which to explore London for a week.