Traveled to San Diego with 8 gals for a girls trip, and JD's place was the ONLY one we found that was stylish and had enough beds for everyone. The spacious and stylish interior was perfect, as everyone had enough room to roam around without being on top of each other. There were plenty of towels, shampoo, soap and even makeup wipes in all the bathrooms. All the girls chatted about how comfy the beds were, and while JD provided earplugs for the street noise, we didn't even need them.
JD was very accommodating and even allowed us to check-in early since our flight arrived before check-in time. He was also readily available when I needed help using the trash compactor (note that if it doesn't open, just turn it on--it will open when it stops making noise).
One thing to point out is that the loft bedroom, while great, does not offer much privacy. It does not have a door and overlooks the main living space. This was not an issue for us at all, but I could see it being an issue if you're traveling with couples.
The location was great, walking distance to Gaslamp and the pier, but also a cheap Uber elsewhere in the city. Would definitely recommend a stay here, and would look it up again if I were traveling to SD with a large group.