We stayed in this apartment for six weeks over Christmas 2014 and loved the whole experience. Firstly, the area. San Gines is located within walking distance of La Azohia and Isla Plana which boast a whole range of restaurants and cafes all of which offer superb lunchtime Menus del Dia at very low prices - don;t expect to lose any weight here! Jump in your car and Peurto de Mazarron is the nearest town just 20 minutes away; a little further and you discover Bol Neuvo with amazing clifftop walks above the beaches and views into sunny blue infinity. Forty minutes by car in the opposite direction brings you to the city of Cartegena which dates back to Roman times. This is where you can find museums (the Maritime museum has an interesting version of the Spanish Armada episode) and a story of how the Spanish invented submarines! In all there are some five or six museums to visit if you are interested.
Secondly: the accommodation. The apartment is great for two over the length of time we stayed. I think a family of four will find it fine for a couple of weeks but then it will begin to feel crowded. The sun roof is a great additional room which allows you to lie out and soak up the sun (yes, even in winter) with views out over the bay and down to Capo Conte (which looks like a miniature Gibraltar). And, yes, weather in this part of the world in winter is the main reason we visit then - it's 90% sunshine even in January.
We have just two niggles which prevent us giving this a full "Excellent" rating and perhaps we're being unfair at that: one is the lack of UK TV (no satellite) and the other is lack of winter heating (the built-in system is just not up to it). We sorted both these out for our stay by using an Android tablet with VPN played through the TV and, because we drove from UK, we were able to take an oil filled radiator with us. Since normal rentals are short summer breaks the latter is not really a valid criticism and who watches TV on holiday anyway?