It was a pleasure to stay with Elmer! He was completely flexible regarding the time of the check in and check out and he left for us some snacks and water, brochures, office supplies, US adaptors and chargers, slippers, etc. He gave us also quite some useful tips to discover the city (we followed your advice and took the bikes in Haight!). The flat is ideally located near Castro and Haight Ashbury and there are plenty of restaurants and bars in the area (don't miss Nopalito). The room was also very nice, there is indeed some street noise but that didn't disturb us at all. And London is very cute! In summary, we highly recommend staying with Elmer if you are visiting SF.