My boyfriend and I stayed here for 8 days and we had the best time! The apartment was exactly as shown, it was clean, well equipped and had a lovely view from the balcony. (Very nice place to sit with a glass of wine and watch the sunset in the evening). The arrival didn't go very smoothly as the host was difficult to get into contact with and we ended up waiting around a bit. However this is the only thing I can fault about our experience so that says a lot.
As for the area in Quarteira, it felt safe and pleasant. 5mins to the beach and restaurants and bars. However if you do stay here I recommend getting a hire car (which we did), public transport seemed pretty non existent...but their is a tourist info point along the beach and they can organise trips including transport for you.
Overall, the apartment was perfect and the host welcoming, 100% recommend!