A service is great when you don't notice it until you think about it. That's what we had during our stay.
Everything I could think of was available at the place I'd think it would be.
I thought I had a small (design) issue with the furry rugs by the bed... until I stepped on one after I woke up. Nice touch!
It may initially seem expensive, but for SF it is very reasonable and if you like walking - really close to everything.
Our host was also very responsive - sometimes instantaneous.
Very happy!