This hotel would have received a solid 3 out of 5 from me if it weren't for an issue with our reservation.
We booked through booking.com 6 months in advance as part of a road trip. We had confirmation that the booking had been accepted. However, when we arrived at the Oasis they claimed they had never received our booking and didn't have a room for us. But we were told not to worry because they just happened to have a couple of rooms reserved at the hotel next door. What a coincidence! We were told it was a hotel of the same value and it would just be for one night. We didn't have much choice so off we went. The hotel next door was AWFUL. Definitely inferior quality. It felt both unsafe and unsanitary. The guy on reception of the other hotel told us that people get bumped from the Oasis "all the time" and that they overbook their rooms. So I don't know if this is a common thing for them to do but we were not impressed and will be complaining via booking.com and asking for a refund of that first night. Beware!
Anyway, once we actually got our room at the Oasis the next day it was perfectly fine. Especially when you consider how much cheaper it is than most hotels in San Francisco. The parking is plentiful and secure. The courtyard in the centre is really cute and gives the hotel a nice feel.
The room was a generous size with a comfy king bed. Yes, the decor and TV are dated but you expect this from the pictures online at booking and everything is clean and well maintained. The shower is hot and quite powerful. It could be improved by larger bath towels and a few more pillows on the bed (only 2 provided) but generally a decent hotel for the price paid.
I've seen a lot of reviews complaining about the safety of the area and homeless people etc. To be honest it's fine! If you've been to any other large city it's the usual that you can expect. Similar to London or Paris. Yes there are some homeless people on the street but a) it's a large city and b) known for homeless people! This area didn't feel any less safe than the rest of the city. I was quite happy walking at night with my partner, just take the usual safety precautions you would in any other city.
And it's worth exploring on foot as there are some great restaurants just a 5 minute walk away. Look for Brenda's French Soul Food and Mel's Drive In. Both amazing.