The neighbourhood is the coolest in San Francisco and safe all the same. The house is an old beautiful one with about 30 steps leading up to 'the cave', a lovely little refuge.
As pointed out by many others before, it is really small, which was totally ok for me travelling solo. What could easily be improved though is a little shelf or at least some hooks to store or hang up things. (The kind of open mini wardrobe outside this room would be accessible to other guests, so I did not use that.)
Speaking of other guests - as it is an old house the walls are very thin so you can hear every word spoken in the adjoining room. Bring ear plugs. ;-)
If you are sensitive to light (and draft), bring a scarf/towel and some gadjets to hang it in front of the window. Some macgyvering may improve the conditions of that room a lot.
As mentioned in the ad, there is no communal kitchen, but a fridge and a microwave in the entrance hall, which is great. Unfortunately only plastic cups and paper plates are provided, so I needed to organise some pot to heat water for a cup of instant coffee or porridge. Actually left the pot there for future residents!
I really enjoyed my stay and loved the place!
Highly recommended!