My wife and I stayed at Sarah's studio for 3 weeks, while on a work trip, and it was comfy and cosy. The place is exactly as described, and the bed and pillows ensure a great night's sleep. The neighborhood - Potrero Hill, has some amazing views of the city and is quiet and peaceful, with some amazing restaurants just a short walk away.
Sarah was a fantastic host! Very responsive right from the get go, surprised us with some goodies (and wine!) as a welcome basket, and was easily reachable if we ever needed anything.
I would definitely recommend her place and stay there again!