There are three other rooms in the place, one of which is cordoned off from main living space with a series of bolted together bookshelves. Sound travels into the room from other renters (if you're unlucky enough to get noisy ones) and outside, as even when closed, the windows do not fully shut. The incoming planes to SAN fly over a block or two away, and come frequently, so you will be able to hear them.
We found the level of cleanliness to be lacking as well, which may have been due to the high number of guests at the time, but the floors in our room had large amounts of crumbs on it, the shower had grungy looking loofahs and scrubbing wands that seemed to have been left by previous guests, and a number of the dishes and cooking utensils needed to have old food cleaned off of them before use.
The place is about a half hour walk from downtown, and traffic in the area isn't an obstacle. Check-in was simple and all electronic.