I never got to talk to Rebecca during my stay there, but Eric is super friendly.
The room is somewhat small, as you can tell from the photos, but is very quiet except for the rattling of the garage door (from the breeze) or the blasting of the nearby train horns that extend past 11 pm.
When a neighbor started playing the drums, Eric proactively reached out to me to ask me if I wanted him to ask the neighbor to stop. I had just planned to put headphones on, but his having the neighbor stop was definitely nicer.
The foam mattress/bed is quite comfortable, and the selection of teas and provided electric kettle are a nice touch.
Eric's working on the back yard, and it looks like it is going to be quite pretty when he's done.
The room doesn't have a television, refrigerator, microwave, or good cellular coverage, but if you're eating out and don't care about watching TV or using your cell phone for calls and texts, then I would recommend the place. I plan to stay with them again on future trips to Mountain View.