The apartment is just as it appears in the photos and even feels a bit more spacious. I did travel with a group of people that were all working from home for a month and did not face any wifi related issues with the exception of the room across the bathroom occasionally having a poor signal (easily fixable by moving the router to a more central location).
The mission valley area is very central to a lot of happening areas in san diego - hillcrest, gaslamp, pacific beach - while still maintaining a quiet + suburban feel. If you stay here, definitely check out Babas Chicken for nashville style sandwiches