This apartment is ideal. We stayed for 4 days, and wish we had been able to stay longer. Marilyn was a great hostess: prompt, pleasant and reliable. Directions from the airport were clear and easy to follow, check-in and check-out was easy. The apartment is a large single room with a kitchen, a nice bathroom, and a balcony with a great view of palm trees, the ocean, and some islands (Palomino and Icacos). Clean, good bed. The building is pretty new, with a nice pool. Elevator, A/C, and wi-fi work well, and the indoor parking space is great. You drive into the garage, by the security guard, park and go straight to the elevator, which is operated with a security key. We hardly used the A/C, because the ocean breeze is perfect. Very important: because of the breeze, we did not see a single mosquito in or near the entire building all week!
The complex ("Marina Lanais") is right next to the 5-star (expensive) El Conquistador resort. (It was part of the same construction project). You can go right over to their waterfront promenade, have a drink at their bar, eat at the restaurants. We did not visit that restaurant, because there are so many other great options nearby.
It is about a 3 minute walk along the road to the center of Las Croabas. The walk is pleasant and safe: there are a lot of people coming and going until late at night, including guests and employees of the Conquistador. The center square of Las Croabas has a great playground for kids, several bars, restaurants, and food kiosks. This is where the kayaking trips to the bioluminescent bay leave. This is a very cool thing to do, both for the glow in the water, and for the experience of paddling through the mangrove swamp in the dark. Here you can also find a few local boat-owners who will offer to taxi you to Icacos or Palomino islands. We spent a day on Icacos, for the snorkeling. A nice variety of fish, although the reef is not in great shape. Nice sandy beaches, turquoise water.
A little further up the road, or a short drive by car, you get to the Cabezas de San Juan nature preserve. They offer a trolley tour (reservations), which is well worth doing. A nature guide will take you through the various forest, swamp, and ocean front habitats, and finish with a visit to the lighthouse.
Easy trips with car: Seven Seas beach (5 min). Luquillo beach (15 min). El Yunque (20 min). And the ferry terminal to Vieques and Culebra. Perfect place, we're hoping to go back.