Having spent the first part of our stay in town in a rental with no hot water and very little natural light coming through the windows, we were more than happy with Zoni Breezes Upper. Hot water runs through the tap and the shower has great water pressure. Since the unit occupies the top floor, natural light is abundant--especially helped by the floor-to-ceiling windows in the dining room and living room. The unit is also very breezy. We opened the sliding glass doors as well as the bedroom windows and let the cross breeze do its work; we had no need for the A/C units in the kitchen and bedrooms. The rest of the unit is equally appointed with guests in mind--the beds are comfortable, the flat screen tv with Dish network has many, many channels, the refrigerator is nice and big, and the washing machine was very convenient. You get all of this and more for a very reasonable price! In fact, one night's lodging + car rental (also from Tom) was less than what we paid for a night in town.
With the car (a Mitsubishi Montero), we were able to visit various beaches on the island. Since we are snorkelers, our main objective was to find good snorkeling. Our favorite spots turned out to be Tamarindo Beach (especially near the points) and Punta Soldado (go out near the big boulder on the left side). We saw turtles, stingrays, and lobsters at Tamarindo and a big grouper (we think) hiding near some rocks at Punta Soldado.
Tom was very helpful in answering all of my questions before and during our stay. In addition, Rogelio, the manager, provided great tips on snorkeling spots and restaurants. We look forward to visiting Culebra again and staying at Zoni Breezes Upper!