I’ve rented two houses in PQ over the last 5 years. The first house was in the Salmon River area south of the 56 and east of Black Mountain. We were on La Tortola, and liked the area very much, although the part of La Tortola we were on was somewhat highly traveled for a residential street. I would be happy to live on Tortola or west of there; the houses get a bit older going east from there.
The owners decided to sell in 2005/6 (wisely, as it turned out, and I’m happy we restrained ourselves from buying) and we rented a house north of the 56 on the hill overlooking the 15 off of Carmel Mountain Road. The view is great, the houses a little older but with decent yards. It’s quieter than Salmon River area, but there is low income housing nearby. The public school is one of the most diverse in the PUSD with significant numbers of low income kids, but they appear to very highly rated.
The commute to the UCSD area is 20-40 minutes depending on traffic.