Nathan's place was great for our stay in San Diego, and perfect for our two kids (2 yr and 6 mo). The location is great - a few blocks from the ocean - and I took the kids on walks every morning along a street with gorgeous houses and ocean views. And the house itself was lovely; very spacious, with a great living room with lots of toys that our 2-year old played with, and the outdoor area was fantastic for eating and playing with the kids as well.
We had a few hiccups (e.g. the dishwasher stopped working in the middle of the stay), but they were very responsive and had it fixed quickly. Overall the communication was fantastic.