We (a couple with a 2 year old girl) stayed here for a week in early September and had a really lovely stay. The apartment is very spacious throughout with a very decent sized balcony to sit and enjoy the view. The double bed was very comfortable, as was the mattress for the travel cot which ensured our daughter slept well the whole week.
The kitchen is superbly equipped and the owner has even provided plenty of basic essentials to make cooking after home as easy as possible (e.g. pasta, sauces, condiments).
The pool is lovely and safe and a real sun trap. The fact that there is a separate children's pool was a real bonus for us.
Back to the view... what a lovely view to wake up to. You can see right across the bay. We had a really lovely stay here and would definitely book again if we come back to Sao Martinho.