I stayed for work with a colleague in Richard's apartment. It was a very good hosting experience that combined work and travel. Richard's apartment is very well located in a city like London. It has two very close subway stations that allow you to be in different parts of the city in a few minutes. Even if you like to walk or bike, you can go to highlights like Kensington Gardens.
The apartment is very spacious. We were two people, but it can also be very comfortable for four people taking advantage of the space in the living room. The kitchen is super complete and the hot shower works perfectly.
Communication with Richard was always fluid and with his son they were always attentive to ensuring that we do not lack anything. This is definitely a very good option to stay in London, be it for work or holidays.