Albert is a nice guy. He answered my questions before our trip, arranged early check in, picked us up from the underground station and even prepared SIM cards for us and showed us where to top-up the SIM card. He answered our questions during our trip via whatsapp too. His studio flat is in a very good location. Just 5 min walk from Barons Court underground station on Piccadilly line, which is a direct line about 30min from Heathrow, and 15-20 min from city centre, Piccadilly Circus, and Oxford street. The studio has everything you need, food, coffee, bread, cereals, soft drinks, beer, power adapter, shampoo, body wash, and hair dryer. The size of the studio is reasonable, considering that rent in London is high as New York. The neighbourhood is a bit quiet at night, but it's generally safe. The shower stall is a bit small for big guys, and hot water is sharing with the neighbor, so sometimes you need to wait awhile for hot water for shower, once you get used to it, that's not a big deal.
One more thing I would like to remind travellers which is not related to Albert's studio. Be carefully and pay attention to people (usually with cartoon makeup, clown or Chaplin. I think they are not local people) who comes to you and take photos with you in Westminster bridge and London Eye area, especially during holiday seasons. These people are very friendly to you at the beginning, but then they will ask you for money, usually 20-30 Euro. If you refused to pay them, they yell and swear at you, or even took your camera and phone. Please be careful. Don't talk or shake hands with them, or even avoid eye contract with these people. And I hope London's police can do something about it, these people are ruining London's tourism industry and the city.