Would 100% recommend staying at Chiho & Nuno's apartment. It is a gorgeous and stylish apartment located in one of the best areas in Lisbon. Although it is located on a busy/noisy street, the windows were good and new and we didn't hear a sound at night with them closed.
Nuno met us at the apartment and was super helpful and friendly, even taking a key off his own set to provide a third key to us.
Large living room with a TV and Bose speakers. Plenty of room for 3 couples. We didn't want to leave!
Thank you Nuno & Chiho!