I went to SF for work, and I stayed in the Dorel Apartments for 4 nights. I would say this was great for the budget and the location.
The unit itself is very minimal just large enough to fit a mattress but with its own private bathroom and a tiny sink adjacent to the bed. This was perfect for me as I spent most of my time at work or out in the city exploring and avoiding homeless people. The unit also has a TV, a small fridge, a microwave, and a heater although I've never used any of those. There is a common kitchen at the lobby level with a vending machine, convenient for those stumbling in late at night after a few drinks in search for H2O. All-in-all it has what you need to stay alive.
I did notice a particular "smell" that the building had but it seems to be a building issue and not the unit itself, but it didn't really bother me too much. Also, the building is a walkup apartment so make sure you're strong enough to carry your luggage up the staircase, otherwise pray you'll run into a strong and handsome man like me to help you.