Location and a laid back vibe are the reasons to stay there - rooms are very small.
Some comments on Jaco in general:
Its geographically desirable location - its the closest beach to San Jose - does not mask the fact Jaco can be (
IS) a hot, dusty, expensive place. Guys talk about the Cocal, and the girls selection; I find it an overpriced version of the Delrey. (Speaking of the DR - didn't they buy the old Canciones del Mar <stayed there 3 or 4 times; liked it but the last trip or 2, you could see the disengagement of management> Any intel on whats going on)
OTOH, new guys, the inexperienced (who don't have a clue how you can Phuck for so much less, and with less hassles in San Jose), the "Los Suenos" crowd - seem to like the place. Personally,I find it full of hard core types <no, not everyone

) reluctant to come off their price which is $100 or more - so regardless, you have to do the old style Delrey type negociation that so many find annoying.
Been to Jaco 12 times; its a great place to fish, but I don't love the town or the nonsense, and there are far better beaches to be visited - but worth visiting....sure.