Danuza's place near Petco park is a great downtown loft with all the amenities you'll need for a stay in San Diego. The location is fantastic and right next to the ball park (which is great but difficult if you plan to have a rental car). There is a lot of parking in the area but be warned that rates get jacked up when baseball games happen. The unit itself is cute and spacious with a living space downstairs and the bedroom/bathroom upstairs. Check-in was very simple and Danuza was very friendly and helpful during check-in.
If you're visiting when the weather is hot, the bedroom upstairs can get QUITE warm. Even with the air conditioning running downstairs, the upstairs never cooled down. We had to sleep downstairs because the upstairs bedroom was unbearably warm. The host did mention that an updated air conditioning unit will be added at some point.