My partner and I love craft cocktails, and were excited to try La Factoria on our second anniversary. You feel instantly cool when you walk through the large wooden doors. The doors don't close, but a strange change in the air seems to separate you from the activity on the street. There are garden lights strung from the graffiti-covered, tattered walls, with XX-esque tunes settling into the curves of the wooden barstools and glowing liquor bottles. It has the feel of a neighborhood bar, but the soft glow from a hanging amber lamp allows for plenty of whispered conversations and lingering glances. We never felt it was crowded, although small groups of friends passed in and out, and a local patron stopped by with her guitar to play a few tunes. The decor is very "grunge-luxe", if that's even a thing. I had the lavender mule and my partner had their spiced old fashioned; both were delicious.
We went into the wine bar next door to get a feel for "the other rooms" which was a big selling factor according to everyone we talked to. The wine bar (Vino) was very, very different, albeit just as cool. The wines are written on a large chalkboard and there is only room for 15 people to mingle about. The din was louder, the light dimmer, the pulse faster. Being at La Factoria is like changing your mood every hour just because you can, without ever having to leave the building.
A must-visit if you're in Old San Juan ... especially if "sexytime" is on your list of activities.