Nick's flat is really great. We stayed there for almost 3 weeks and didn't want to leave!
It is clean and comfortable and has everything you will need. The building has a lift and 24 hour security.
The location is great with a bus stop right outside the building; and a short walk (around 7 minutes) to Maida Vale Tube Station (Bakerloo Line).
Nick himself is one of the best hosts we have dealt with. Very kind, helpful and a nice gentleman! He gave us clear details on how to find the place; he met us in front of the building and helped us with our luggage to the flat. He gave us a full detailed orientation of the flat, and places to visit and eat, etc. He was always reachable by WhatsApp whenever we needed help.
We highly recommended Nick's flat for short or long term stays.