Sonoo is an excellent host, very responsive. Very short walk to excellent museums. Gloucester tube station a very short walk and easy transit to and from Heathrow from there if wanting to save on transport. Also a short walk from Big Bus Tour stop (by Gloucester station). Went to Victoria and Albert Museum twice since so close.
Apartment easily accommodated our group of 6 without feeling too crowded. Sonoo was also very flexible with us having an early arrival. Would certainly recommend.