I did a 3 month stay in San Francisco for work. I stayed the entire duration of my stay in Rebecca's unit and couldn't have been happier. It is very well located for public transportation and couldn't be any more in the middle of the city.
The unit itself was great. Comfortable bed, clean, and great amenities like the washer and dryer. Also the kitchen was very nice a great for people who plan on doing long stays and don't want to eat out every day.
I would definitely recommend this place for your stay. I hope I can book Rebecca's place again if I do another extended stay in the area