I'll sum it in one word: Perfect. My stay here was absolutely wonderful.
Pros:
1) Location: Mission is a great place to stay of you want to see SF like a local and go to restaurants and stores that embody the spirit of San Francisco. I even got thai food delivered on my first night at like 10 pm. It's not touristy like Downtown. But it is very accesible thru Bart.
2) Room was very clean & neat. I thought it was super comfortable.
3) Great Amenities : It was well stocked with everything you could possible need during a visit. Kind of like staying at your friend's place. So there is a fridge, a microwave, books, tv, etc....
4) Very good communication from David & Tina. Every step of the way they replied to my emails, answered all my questions and made me feel very relaxed that everything was going to go smoothly. They let us leave our luggage for a few hours too.

Cons:
1) Only one. It is very noisy with the street sound. But that's not their fault and it is because I am from a place where it is real quiet so I am not used to being woken up by Car horns.

Anyhow, this is the best place I have stayed in in SF. And I visit every year so.... I am going to make sure I book it in advance every time.