Excellent apartment - the pictures don't do it justice. Sea view from the balcony is great. Only a short walk to town and beaches plus there are some good bars and restaurants around the corner as recommended by the owners who are very friendly and accommodating. El Medano is a nice laid back resort -- recommend you take a walk along the beach and up the (small) mountain (sensible shoes required!). Once you've finished chillin you'll need a car to explore further though. We stayed 2 days which is as long as you need unless you're really into windsurfing.
The apartment was very nice, clean and comfortable. The owner is also very helpful. We especially enjoyed the beautiful view from the terrace and the location close to the center of el Medano.
The only negative point I want to mention is that there are too less pots for cooking.