We had a lovely at Alexander's studio.
We didn't have the chance to meet Alexander during our stay, but it was very easy to communicate by texts en emails. The studio is very well located, walking distance from restaurants, shops (Oxford Street), metro stations. The bedroom is very comfortable and the flat is very clean.
Unfortunately, there is no windows in the bedroom (because it's at the -1 floor of the building) and it came be quite noisy in the morning because of the shop at the ground floor.
Overall we had a very nice stay, we recommend it to anyone who wants to visit London.