We had really great winter holidays at João's place.
The apartment is perfectly located: the neighboorhood is both authentic and close to the center and you have some cheap and delicious places to eat just around the corner.
We didn't use two-storied patio much because of the weather but it should be really sunny in summer. It has some shadows from the trees too so you can choose.
The apartment has central heating that is uncommon for Portugal but very convenient in the winter. We've been in winter in Lisbon before and it was the first time we could sleep not freezing in the bed.
The only thing you should consider is that some of the doorways are rather low and the flat could be not very comfortable for people of height 190+ cm.
The host was very pleasant and ready to help. Thank you, João!