I had the pleasure of staying in the Mallorca apartment this fall when visiting SF for a conference. The place was precisely as advertised -- lovely, cosy, full of amenities. It's in an excellent part of town -- the Marina -- and provides convenient access to a variety of services and locations. Chestnut Street (just two blocks away) has more restaurants than you can possibly try in your time here; I enjoyed Causwell's at the recommendation of a friend, but the host has many excellent suggestions as well. What's more, the apartment is just blocks away from the ocean, and about 5 minutes away, you can access Golden Gate park (if you're really adventurous, you could venture to the bridge or take a bike to Sausalito).
Most of all, I was satisfied with the hosts. They accommodated a last minute request on my behalf to stay, were lovely to talk with and offered many useful suggestions, and were attentive and responsive during my stay.
I would without fail recommend this property to anyone else, and hope to stay again the next time I'm back.