I only stayed at Dongmei's place for one evening and enjoyed my stay overall. The room was very clean, and I liked that the King Room had a private bathroom (though you need to exit the room to access it.)
Check-in was a breeze, and there were some thoughtful touches in the room, like a mini-fridge. The room has many windows which provided a comfortable cross-breeze. While the windows all had curtains for privacy, they did little to block out the light, so I found myself waking up earlier than I would've liked. The bed was spacious, but, as others have noted, it was very firm.
The neighborhood is not in the most amazing location, but San Francisco is small, so everything is just a short Uber/Lyft away!