I groaned when we climbed 3 flights of steps to the apartment but we got used to it and didn’t have much luggage. If you have bad knees like I did a year ago, it wouldn’t be good. We walked uphill for 4-6 minutes to Sapadores bus stops to catch convenient buses and tram 28E to take us downtown and elsewhere.
The small balcony was nice to have drink on.
Unfortunately the apartment is next to a fairly busy street.
Luckily it was cool at night during our stay and we could close the bedroom/balcony door and roll down the metal blinds to block out noise and light from street lamps. With a fan it was cool enough to sleep comfortably. But in heat of summer it could be a problem for some. We also learnt that keeping metal blinds in balcony door and kitchen windows down kept the sun from heating the apartment while we’re out all day. Some neighbours do talk loudly in the streets and cars and trucks can be heard clearly with balcony door open. But there was no noise from neighbours living in the apartment building.
If you’re an active traveler I recommend buying the Lisbon card even for 24hours. We bought a 48h one this trip and I bought a 72h one in June 2019. The Lisbon card also allows you to beat the queues to enter museums and Jeronimo monsastery with easy electronic kiosks. And you can use it for unlimited rides on the lovely Santa Justa elevator. We did it at 1030pm and again at 9 am and didn’t have to queue long both times.