Hi Manuel,
Yes, I did go to Puerto Rico for a conference back in late May and stayed at the Tres Palmas Inn, which shares a storage space with Sotavento. Unfortunately, I got there a little late in the season and was not able to windsurf, but I did take a SUP out one morning at the crack of dawn and tried my hand at SUPsurfing, along with about 7 locals. (Needless to say, the locals new what they were doing. I, on the other hand, had some pretty entertaining crashes). Good times, though!
The guy who runs Sotavento is named Albir and was on the pro wave-riding circuit in Maui for a number of years. There's not tons of gear, but he has some nice gear if/when available. He had three RRD boards (I think in 102, 112, and 122 sizes, or thereabouts), as well as RRD sails. Also had about 3-4 SUPs, mostly RRD. When you're there next time, you should check it out. (Oh, and they also have kite gear.)
Two highlights of the trip were that I got to see a kiter on a hydrofoil board (pictured), and I got to hear and see El Gran Combo de Puerto Rico. They're one of my favorite.
Hope all is well!