Lovely apartment, comfortable, clean, good selection of pillows, well equipped, and a cozy backyard where you can enjoy the sunshine from morning to mid afternoon!
If you are sensitive to noise, note that you are at the mercy of nearby guests and how considerate of others they are. My experience is that not even the best earplugs will help you if your neighbors are noisy. Mid September during the weekdays Portorosa is rather empty, so you can relax, also on the beach. By the way, the beach is a good 15 minutes walk from the apartment. Lovely walk though as Portorosa is such a beautiful place. The beach is pebbly though but the water is calm, clear and warm. Enjoy!
I warmly recommend Andreas apartment.