We stayed with Olivier for one night before leaving the US. It was very uncomplicated, I only booked a few days ahead (lucky us it was available) and he was very quick with answering. Moreover, he let us into the room earlier than the actual check-in time and tried to make it as convenient as possible for us.
The pictures on airbnb are acurate, it is a cosy room with a bathroom, towels were provided, there is a small fridge and a fan... check out all the other reviews... 100% positive.
You can walk your way through Santa Monica, it is safe, lots of eateries nearby in walking distance on Main St.... Airport not far, few dollars with UBER.
And when we got a bit unlucky with quite unpleasant noisy guests in the adjacent room (again, check the reviews, seldomly happens) Olivier tried to get them to keep it down and offered us a discount in the end. Not to take for granted in my opinion, wasn`t his fault, sometimes you just get unlucky.
All in all, highly recommended. Maybe bring a sleeping mask.