This is my 2nd time at Irina and Greg's place in San Francisco, and everything went great. Although the room is very basic, Gregory made sure I had everything I needed for my stay that night. Irina is very responsive by email if you have any question.
The location is absolutely fantastic, with amazing pizza places nearby, a 5min walk to Telegraph Hill and very close to lively neighborhoods. If your plan is to be centrally located in SF for a reasonable price, I definitely recommend this location!