Marco C.
Yelp
If you're staying in Vieques, Casa de Amistad is a pretty good choice. At $89 a night during high season (at the time of this writing), it's pretty inexpensive. Owen, who runs the place, is very personable, and is really quite helpful. Overall, it's a very social guest house,with a pleasant shared kitchen, a reading room, a little Internet cafe (and free Wi-fi!), and a backyard and a roof deck where people can be found relaxing and drinking pina coladas and Medalla Lights.
I only have a few beefs with the place:
1. They kind of nickel-and-dime you a little on the waters, beers, snorkeling equipment, and beach towels. At $2, $3, $10, and $2 respectively, the prices are a little steep, but I guess that's one way they recoup the cost of running an otherwise inexpensive guest house on a remote island.
2. The coquis (a type of frog endemic to Puerto Rico and outlying islands) are loud as hell and like to hang out in the bushes and birds of paradise plants just outside the rooms. Generally the coqui makes a rather pleasant whistling noise, but it gets a little old when they're blaring it at 100 decibels right outside your bedroom window. This isn't really the guest house's fault per se, but it wouldn't kill them to chop down some of the vegetation out there to make it a little less hospitable to our froggy friends.
3. Our bathroom had only some hanging beads separating it from the main room, leading to some slightly awkward situations. My girlfriend and I have been together 5 years, so it's not that big a deal, but it's not terribly romantic. Would it have killed them to put a door there?
Despite the above beefs, I'd still probably stay here again if I were to go back to Vieques.