Anyone know anything about the Green Tortoise Hostel in San Francisco?

Call the Green Tortoise. Most Green Tortoise hostels have both 'hostel rooms called 'dorms' and one or two 'private rooms' for two people. I'm 58 and have stayed at Green Tortoise and enjoyed myself. While many of the other people who stay there are younger, the 'average age' is more like 50-60 but 'adventurous' so you'll fit right in no matter what kind of 'room' (bed) you want. There are Green Tortoise Hostels all up and down the west coast, and as far east as New Mexico, possibly farther. Ask when you call, and have a nice vacation!