here is a review found by doing an internet search with the words 'casa zeller in san jose costa rica'
Best salsa dancing in San Jose
If you are a salsa lover there is no doubt that Casa Zeller is the place to be on Friday night (take a taxi... it's somewhere south of downtown San Jose). Entrance is 3,000 and dancing starts a little after 9:00. The slightly high price is due to the live band and worth every penny. In contrast to Salsa 54 and Castro Bar, most of the music in Casa Zeller is salsa, with some marengue and a tiny bit of bolero and cumbia. However, most people arrive in couples and/or groups, so if you're all by yourself you may find it challenging to make it to the dance floor. Dress code (for women) ranges from jeans and a T-shirt to a super-short mini skirt and tight top with the obvious high heels.
it looks like it is a cafe/bar with live music on at least some weekend nights...and perhaps just a resturant during the week days.....I do not believe it is a blatant play for pay pickup joint like the Del Rey.
However, since the vast, vast majority of CRT members are smooth operators with all kinds of game, it should be an easy challenge to visit a club like this and score at will...gratis!....