Carl was easy to communicate with and even though I booked rather last minute, he made it simple for me to find the best transport to/from the airport , meetup for easy checkin, etc. Carl's home is in a wonderful neighborhood that has gotten very posh in the past 10 years (I remember it was anything but, back in the late 60's). The fact that you can get there by taking the N light rail train (although just know that it's PACKED during commute hours ) makes it one of the most convenient places I've stayed in SF.