We stayed in this perfectly located, lovely place over New Year's week 2018/19. It is perfect for a couple (like us) or a couple with kids who can sprawl out in the main living area on the pullout sofas. The apartment is very clean, terrific bathrooms with good showers, hot water and water pressure. The views are amazing and even better than in the pictures. the sleeping loft is cozy and warms up nicely on cold evenings. we would stay again. A couple of things to know;
1. Lots of steps up or down to reach the apartment. You can minimize them by taking the tram to Portas do Sol--but there are still some steps to negotiate. Not a problem for us--but would be difficult for a limited mobility traveler.
2. Kitchen is not terribly well equipped. Not a big problem, but if you are a serious cook i think this would disappoint.
3. It is a renovated apt in an old building and the electric system can't handle too much (like the heaters and microwave or blow dryer) at the same time.
We loved our stay and loved Lisbon. perfect location in the old town--highly recommended!