First off, the location is PERFECT. Just blocks from beach, shopping, pier, train to downtown LA, etc. The value of the room with private bath is amazing in this regard. You will likely not find a more reasonably priced airbnb in Santa Monica center of town.
Regarding local dining, i'll highly recommend 'The Gallery Food Hall' on the Promenade. There are multiple restaurants with foodie quality dishes at reasonable prices, and since I was there during happy hour, craft beer pint was only $2! They have a spacious deck for outdoor dining on the 2nd floor, it overlooks the street for great people watching or carousing with friends.
I arrived late afternoon, and was greeted by Tomoko's mother outside. She showed me the room and amenities, including a very large shared rooftop/porch area. I was hoping to practice my Japanese, but her mother wasn't too interested in conversation, and her father didn't speak Japanese. No matter, they were certainly cordial, and being able to practice 2nd language would have only been a bonus. There was always a full, filtered water pitcher on the dining table, which was a very nice gesture considering how thirsty I was (California is dry and warm always).
* The bed is not a queen, based relative measurement to my 6 foot tall (182 cm) body * The bed was very comfortable, might have been pillowtop mattress. It was very nice to have a couch in the bedroom as well as a private bath. There was no air conditioner in the room, but a oscillating fan on the desk next to the casement window. Cool air would come into the window at night, making it plenty comfortable. The bedroom window faces an alley, from the 2nd floor. Even with the window open, it was never noisy, its a quiet neighborhood. The shower was very clean, you'll have to wait some time for hot water, be patient.