The apartment has a good location - 15 minutes walk to downtown & seems/feels safe neighbourhood despite being next to several strip-clubs. The apartment is next to China town and Little Italy, Italian district in SF. So lots of good places to eat.
It is located on a very tiny street off the big streets Broadway and Columbus. So there is no traffic noise but especially during a weekends, it could be noisy in the bedroom because of the nearby bar. The sofa folds out like a full-size bed. It's quite ok to sleep but not as comfortable as a bed. The place has a particular smell but once you are inside for some time you don't notice. The bathroom was clean and water as hot as you prefer.
WIFI worked well. Arbe is a nice host. She answers quickly to SMS and e-mails. She also left some stuff into her fridge for us.