This place has two big problems; lack of cleanliness and way overdue maintenance.
Lack of Cleanliness: The owners need to have someone come in and do a deep cleaning. The kitchen was fine but baseboards needed not only cleaning but a fresh coat of paint. The bathroom was dirty...not just dust, but dirt. In a bathroom closet were towels that were crammed together in a big ball. You didn't know if they were clean or dirty. If they were clean they should have been folded and stacked neatly. If they were dirty, why would they be crammed into the bathroom closet? The place wasn't "health threatening" but it was just plain dirty throughout. There are no excuses for this, other than lack of attention to detail and a complete disrespect for consumer value.

Lack of Maintenance: Man, this list is long. The bath fan doesn't work. There is no popup on the bathroom sink and as a result a toothpaste tube cap from a previous guest had fallen into the drain. You couldn't remove the cap without tools. The shower head had been there so long that you couldn't adjust the spray or even tip the head up or down. It was "stuck" due to the buildup of lime. Hot water was abundant but the flow was retarded due to lime buildup. We paid over $1,000 to stay in this place and the owner can't go out to home depot and buy a frikkin 10 dollar shower head? The wooden chairs in the kitchen were wobbly. They probably could have been fixed with some glue and a clamp or two. We are of average weight yet had to sit gingerly on these chairs. There was a plastic part on the shower tile that had broken. Why not remove it? The lack of attention to detail was evident by a placement of a smoke alarm about 4 feet off the ground that was stuck so crooked on the wall that it looked like a 3 year old was in charge of its placement!
We resided in this place for 4 days and were in the cottage mainly to sleep at night. The location was fine. The neighborhood was secure. The upstairs tenants were friendly. We enjoyed San Diego. We're not very picky, but the owners of this place need to shut it down for a week, do some regular maintenance, paint the baseboards, and conduct a thorough deep cleaning.
I travel the world over and use Air BnB often. This is the dirtiest place that I have stayed in. I also own and run a bed and breakfast in Minnesota. I would shut it down if it looked like this place.
To the owners: I harbor no bad feelings toward you. We enjoyed our short vacation. But I would admonish you to look in the mirror and decide that you are going to turn over a new leaf and deliver value to your customers. On the cleanliness and maintenance side, you are not delivering value now. You could do much better.
I saw many vacation rentals in the neighborhood and regretted my choice.