We had our best family vacation ever at Casa La Puerta! The house is wonderful, with gorgeous views and a sparkling pool (the pool guy came and cleaned at least twice while we were there, which was fantastic). The kitchen is very well-equipped; and the owners have thought of everything and provided it for guests. Toys & towels for the pool and beach, coolers, reusable water bottles, card and games, DVDs, extensive restaurant recommendations & guidebooks...you name it! The house was spacious and immaculately clean with tasteful furniture, and the owners graciously loaned us everything we needed for our two year old - carseat, high chair, pack and play. This made travelling so much easier.
Our older kids (4 and 6) were thrilled with the pool and of course the island's incredible beaches. The grownups loved the grill, and sitting outside on the terrace after the kids were in bed. Our favorite beaches (all great for young children) were Media Luna, Secret Beach (aka Plata Prieta), Sun Bay and Blue Beach. Our favorite restaurants were Next Course, Tradewinds, Duffy's and Bili. (We also had a great lunch at the W Hotel but that resort isn't really in keeping with Vieques' laid back island life.)
We rented a Jeep from Juergen at Abreeze guest house, which was very straightforward; he can pick up from the airport and drop you back there, and Abreeze is very close to Casa La Puerta.
Overall, I would absolutely recommend this fantastic family-friendly house to anyone wanting to visit Vieques.