Let me first say that we had a wonderful time and nothing I'm about to write would prevent me from re-renting but I'm going to be brutally honest from the point of view of a father with 2 toddlers under 4.
Location is amazing, close to the beach and there are decent places to eat close by. Traffic down this way is a bit much but nothing too bad since you're on vacation and you're not on timelines who cares really. Plus being on the first floor with toddlers is ideal so as to not to try lugging all their beach toys and everything else up and down stairs.
Some things I didn't realize or took for granted, and have nothing to do with the quality of our stay but things you might want to be wary of. There is no a/c unit, I'm sure most of the time in San Diego this isn't a problem but being from Phoenix we take our a/c seriously and not having one was rough the day we arrived and the next as it was hotter than normal. That said, opening the windows and using the fans provided helped a lot but that first night was hard to sleep with the heat and humidity.
Bathroom issues: so I didn't realize there was no tub, only a shower, when I booked it, not a big deal but having 2 toddlers under 4 we bathe them to clean them and it was a little tougher on us to use the shower with them especially since there's no removable shower head wand. Maybe something for the owners to consider installing. We dealt and it all worked out though. Bathroom counter space, next to none, a little shelf above and below the mirror but my wife and the kids have a lot of bathroom stuff and with the pedestal since, there's really no space, there is a small shelf for stuff opposite the sink. Again, not a big deal and we did ok here, just more of a convenience thing if you have a lot of bathroom items.
Front door: we loved that the door is a split door and you could open the top and leave the bottom locked, we used this feature extensively to allow air flow into the place. Unfortunately it's almost all glass and see through doors though, so at night it has a clear site into the place and faces directly the bedroom so unless you close the bedroom door, everybody can see you sleeping. A shade or something that can cover the windows at least at night would be good to have.
Parking: They covered this pretty extensively in their listing and they are NOT lying about it. The car port is tiny and street parking for us was horrendous as there was literally never a spot within decent walking distance to park at. Luckily the neighbors had a small SUV and a big enough spot to fit all our vehicles so I would suggest getting to know them and seeing if they mind letting you park there or allow them to park in the car port even.
Rinsing off: The owners suggest rinsing off the sand before entering the place as to not track in a lot of sand. I wholeheartedly agree with this and we did the best we could. The hose bib next to the front door is horrible though from what we found, it sprayed a lot and was not ideal for rinsing, a possible hose would be nice for this to help direct the water better. Also, there is a hose bib on the other side of the house, next to the window of the bedroom. This is apparently used by everybody walking by usually and is really loud if you're trying to sleep early.
Cheyann was great though, she responded well to messages in a timely manner and we didn't really have any issues the whole time we were there. Everything else was generally great, the internet and video on demand was convenient. The place itself was very nice and clean. Lots of space for my kids to play in the main living area. Being so close to the beach, we were able to spend a lot more time enjoying the beach than last time with having to pack up the car, drive, find parking, unload, etc... This was a great place to rent and I would highly recommend it.