I've stayed in Hermosa Beach a few times now at different Airbnb's. Mary's place is pretty good.

Pros: Mary is very nice and an experienced host, great location, just a few blocks from the beach, private bathroom, a dog, quiet place, laundry.

Cons: the two full size beds fill up most of the room so it feels a little cramped, relatively small apartment so not as much privacy as I've experienced at other Airbnbs.

Warning: I saw in the listing the mention of a dog, which is fine with me because I love dogs. However, the dog is a large male boxer who growls at you when you walk in. Again, not a problem for me. However I imagine someone who isn't as comfortable with dogs may not feel as good about this.