We spent nearly a month at Chris's place in December 2021 into early Jan 2022. The house has an ideal location for hiking -- there is a hiking trail a 2 min walk away at the end of west altadena drive. We went there almost every day and loved every minute of it.
If you're rich, you might consider looking for something more expensive in the area. We liked the price on this house, especially since we were staying for the better part of a month.There were a couple of bumps in the road -- the roof, ceiling and foundation of the house leaked into the living space whenever it rained hard (maybe not a problem in the dry summer). We had to use pots and pans to catch the water and move the furniture to prevent it from being damaged.
Heavy rain also brought ants afterwards -- we learned that we had to be extra careful with crackers and cookies -- they should always go in the fridge -- this we learned painfully on Christmas morning when the ants beat Santa to the cookies left next to the fireplace. Chris made sure, though, that there were plenty of ant traps and other pest control measures, so we were able to handle it ourselves without much stress.
The house was also kind of dirty when we moved in -- we had to swiff ourselves a couple of times to get the floor to a place where our socks weren't black-bottomed, and actually found a pair of underwear from a prior tenant under one of the beds as we were doing our final sweep of the house the day before we left! The kitchen and bathrooms were decently clean, modulo the ants. They're not the big ones, so it's not really a big deal when one or two creep into the bath with you.
But again -- the price -- everything else in the Pasadena/Altadena/Montrose/Crescenta highlands area looks a lot more like 200/night vs. 100/night. Take that into consideration!