The apartment is good for a small family or a couple of friends. It does say in the listing that there are 2 sofa beds - there are not. There is a sofa bed and a fold up cot.
This location would not be great for anyone who could not manage the incline of the street.
Sleeping will be a challenge for anyone who is a light sleeper or cannot benefit from a white noise app.
It is directly under the flight path of arriving planes in Lisbon. Planes land every 2-5 mins, 24 hours a day. As one of the other comments mentioned, there are roosters in the park right outside the apartment. They call all day and night long. They may disturbed by the planes and not follow a natural rhythm. You can literally hear them all night.
The parking garage door is directly under the apartment.
I am a light sleeper so did not sleep at all.
None of this is about the hosts, just a heads up for others.