On the plus side: Wonderful hosts. Instantaneous responses while communicating. Condo in great shape all around. Decently stocked kitchen. 15 minutes walk from Balboa park and Gas lamp quarters. Metro station literally under the Apartment complex. For most of San Diego, you won't need to rent a car, taxi or public transport is enough.
Only negative, is outta hosts' control is homelessness in downtown San Diego. Metro station with a 7-eleven at bottom of apartment doesn't help.