The apartment is located on the top (4th) floor of the building. It is very spacious and minimalistic, which we appreciated since we travelled to Portugal with our 3-year old son who loves to touch things:)
The beds were super comfortable and the linen looked almost brand new. The internet speed was good and the place had most things needed, aside from toiletries, like soap, shampoo and trash bags.
The only issue we had with the apartment was the super slow drainage in the shower...hopefully the owner will be able to get it fixed for future guests.
One thing to keep in mind: there is a rooftop bar Java that plays loud music till about 1 am every night. If you are a light sleeper, it might keep you awake. That said, our kid slept through it.
The area is nice: you are in the middle of the action: great restaurants, cafes, time-out market with some quick food options. Also, there is a big farmer's market right behind the time-out market - check it out as it has a huge variety of fresh local produce for a very good price.
Restaurants to check out: Fares, Estrela da Bica, Baoba cafe.
Best transportation: Uber - cheap and quick. I would stay away from tuk-tuks - they will reap you off.
Things worth doing outside of Lisbon: check Cascais, Sintra, Azenhas do Mar.
For things to see in Lisbon, buy tickets online to avoid long lines.
Hope this helps!