It is a fantastic area with a fantastic host and his cat. It is a beautiful old and safe area, you can enjoy watching every single house in it. George's house is located in a tiny calm street just 1-2 blocks from the 'busy' part of Castro.
George's apartment is also very cosy and calm, so if you make a lot of noise or a party animal, you might prefer a more busy area. The bed is so comfy, that I spent even more time in it than I should have to. Special thanks to George for the heater in the room.
George is very welcoming and easygoing host, so if you have any questions about the apartment or SF, he'll definitely give you any necessary information.
So, if you are a single traveller and want to stay in a calm place close to downtown, don't look further, stay with George.