Nick very kindly accommodated me at very short notice when I arrived in London a couple of weeks ago - his responses through Airbnb were prompt and helpful, and he was very friendly in person with loads of good advice for settling in and getting around.
The apartment is fantastically located (short and easy stroll from Baker Street tube station, with plenty of food choices along the way), clean, and furnished far better than a hotel room would be.
I was out late to dinner with friends and felt secure walking home at night. There is a concierge at the reception, and a decent gym.
In short, I found Nick's apartment a superbly-located, reasonably-priced and exceedingly comfortable place to base oneself in hectic London.