Visited this jewel today - amazing place full of interesting objects, and they have great coffee! I ordered a latte from the friendly barista, and took my time examining all the merchandise and decor the small shop has. Nicely decorated, with a leaning toward black magic as some have mentioned. I made myself comfortable and worked for a couple of hours, wifi was fast and easy. The owner came in at one point, and checked on the guests in the shop, she was very friendly and nice.
So if you are looking for a good coffee house that eschews the normal decor for the eclectic and has friendly staff - try Subsecreto.