My parents, brother (19) and I (21) stayed at Katja's home for a week. The house is located at a very good spot! Not a lot of noise and a nice neighbourhood. We had dinner at El Torito which is very close to the house and has good food so I'd definitely recommend that place as well.
Our communication with Katja was very good and she answered any questions that we had. The house itself was very homy. I've been to a lot of airbnb's where you can compare it to a hotel but this is more like you really get to sleepover in someone's house. (a very nice house) There's one "master bedroom" and 2 bedrooms with a single bed. (You could also sleep on the pull out couch or the normal couch in the living room because that couch is very comfy!)
We were there from 6-14 november and the weather was around 25 degrees celcius! A little cloudy sometimes but most of the time the weather was great especially when you're used to a colder winter with 9 degrees celcius.
Katja's house is very close to the famous Santa Monica Pier and Beverly Hills! We also went to the griffith observatory to see the famous Hollywood letters and we visited the street with the Walk of Fame. My brother and I also went to the Universal Studios.
We really have a great stay and would recommend your place to others. :)
Last thing: Uber is great to have in Santa Monica/LA if you don't want to worry about going somewhere and drink. There's a lot of them in LA and most of them are able to pick you up and drop you of within 5 minutes of your "call".