This is a perfectly adequate budget option for a San Diego trip. The space was clean and the water pressure in the shower was actually excellent. A few things to be aware of:
1) The unit does not have AC that we could locate, and while one theoretically doesn't need AC at night in San Diego, the unit was always *substantially* warmer than the ambient outdoor temperature, even with windows all the way open. They do provide several fans, which make a huge difference. We slept comfortably and it was usually cooler by morning, but I wouldn't have wanted to hang out there.
2) The bed is advertised as 1 king OR 2 single beds. The "king size bed" is actually the two single beds pushed together with a full-size mattress pad on top. That leaves a pretty significant gap, which they position towards the top of the bed and just pad out with extra pillows (so the surface you're sleeping on is perfectly level, but the surface your pillow is on is substantially lower). It wound up being perfectly comfortable but was definitely a bit jarring.
3) If we'd gotten into San Diego on time, we would have been a few hours early for check-in, so we reached out about stashing our bags somewhere on-site during that time. I've never had difficulty with this kind of request before, but the host for this unit was not able to accommodate it.
The space on the whole is pretty dated and lower budget, but it is clean and the bed is comfortable. If you're looking for somewhere to sleep without breaking the bank, it gets the job done.