Would give the room 4 stars: great location in the middle of the Gaslamp district, true to the pics, big bathroom, comfy beds, not as small as expected from the reviews (although I'm not sure I would recommend for 4 guests or if you have a lot of luggage), and very easy check in.
I went with 3 stars mainly because of the shower since we had to leave the water running for at least 10 min to get hot water. They did not warn us about this until we asked, so the first shower was a pretty cold one. And if you're like us and don't like wasting water, you might not be a fan of this. Water pressure was also not great (part of the hot water problem).
Also, because of the way the AC is installed, the window doesn't close properly so you get quite a bit of noise from the street. They do warn about noise in the weekends, but this was a bit more than that. It was fine by me, but maybe not ideal if you're a light sleeper.
All in all, I would probably still recommend because of location and price.