The apartment in Polace on the island of Mljet was great. It had two bedrooms, two bathrooms, and a couch that was spacious and comfortable, so our 12-year old preferred to sleep on it. The balcony had a wonderful view of the sea, this was a special treat: it was large, so the four of us could have coffee in the morning, eat and chill in the evenings. One of the bedrooms has a fantastic view of the bay. You can access the balcony either from the living room or bedroom. The a/c is strong enough and cools the enitre apartment.
It takes 20 minutes from the apartment to walk to the Large Lake, the electric train, and numerous little beaches along the lake. If one does not feel like walking, bikes can be rented. Several rental places are 5 minutes from the apartment.
All in all, the family taking care of the apartments is wonderful, the village is peaceful, there are restaurants, and the local beach is almost empty, which I have never seen before in Croatia at the end of July.