Stayed in the loft (converted attic) with my girlfriend for a weekend vacation. The entire house is converted and revamped, hosting multiple people at once, yet everyone is friendly and/or tends to keep to themselves. Michael has staff to accommodate check-ins and anything else that may be needed. They were all very helpful and welcoming.
What really helped was being able to drop off luggage early, especially because our flight came in several hours before check-in time.
The location is just a block or two away from Little Italy, making it easy to get around. Balboa Park is a short drive away, and La Jolla is about 10-15 min out -- definitely recommend catching a Lyft or Uber if you want to make your way out there. Gaslamp is also about 5-10 min away.
All in all, the reviews you've seen posted before are spot-on. The house is regularly kept clean and has great common areas to hang out in, especially the outside garden areas!
The only negative I can think of is the attic can get hot, but the staff makes sure to keep the fans and A/C running once you check-in, so it's really not a problem so long as you leave the sunroof covered. Even the planes aren't that loud, we were able to sleep through them flying over us without a problem.
Awesome place, awesome host. Definitely would love to come out and stay again!