I just booked Petco Park San Diego 30 Day Stays on the south side of Petco for around $1500 for 6 nights (a block or so from the parking lot where many of the offsites are located.) I got a 2-bedroom apartment with a full kitchen, washer and dryer and more. It's at booking.com. The original price was around $1200 but along with the usual fees, they charge a $150 cleaning fee. Still, not a bad price for the location.
They say they've been part of Booking.com since October 10th, so I'm assuming this is a new property.
There's one left I believe. They also have a Gaslamp San Diego 30 Day Stays on G street that is also accepting reservations.
You'll be charged upfront by the company, but you can cancel up to 2 days before. I booked it based on it's location and to avoid Hotelpocalypse...plus the fact that the place looks huge.