I wanted to list some reasons to strongly recommend you to stay in this place for your SF trip! :D
1. The location was great with easy access to public transit: muni bus, and N line
2. This is a safe and lovely neighborhood and lots of nice restaurants and good coffee shops are nearby. Carl gave us the list of good spots to visit among of them, and every place we went just amazed us. 4505, The mill, The grind....and Sightglass became our local cafe.
3. His daughter is really responsible to keep the place nice and clean as a housekeeper. and you will have extras for everything: pillow, towels, blankets, etc.
4. It's a well furnished house and gives you cozy and comfy 'home' atmosphere. They even has an outdoor hot tub to use!
5. Carl is a nice sweet host who lives in the same building, he never intrudes, but loves to chat and get to know his guests; he really cares.