Antonio is a great host! We were able to get to the appartment early which we appreciated a lot.
The appartment is super well located - close to a metro station. It is up one of many Lisbon's hills and we still managed to get to it by walking with our suitcases - it is steep though! You can either use stairs or walk up the hill. From there, we pretty much walked everywhere except Belem and Parque de Nacoes. The appartment looks bigger than it is on the pictures but it was really perfect for our familly (2 adults and 2 children). It was also super clean and we definitely enjoyed the French doors opening to semi-balconies. Since there is no air conditioning, we left dors/windows opened all the time to keep the air flowing. The beds were very comfortable and the bathroom functional although a bit small.
It is not located in a "lively-party like neighbourhood", but it was quite noisy at night with people walking, talking loud and also the garbage trucks emptying the bins every other night. With the current summer heat and the fact that there is no air conditioning, we wanted to keep the windows opened at night but just couldn't sleep due to the noise outside. We did have two fans, which helped a bit.