My wife and I had a really wonderful time at this Airbnb overall. A couple things:
Pros:
+The balcony is truly incredible, better even than the pictures make it look. You have a great view of the city, and it's even better at sunset. It's so nice to eat breakfast or have a drink at sunset out there.
+The overall location is great - close to a great neighborhood and everything else (including the main train station and metro/bus stops), but not too loud at night.
+Bed is comfy, bathroom is nice with a good shower, and living room is good.
Cons:
-This apartment is on the top floor, up 4 steep flights of stairs, and you have to walk up probably 30-50 stairs to get to it depending on where you're coming from. Granted, Lisbon at large isn't particularly accessible if you struggle with stairs, but this apartment is definitely not for people who can't handle doing that multiple times a day.
-Communication with Flávia a little hit or miss; there were a couple times when I messaged her about non-urgent things both on Airbnb and WhatsApp and never got a response. We heard from her right at check-in and that was pretty much it - and this led to a couple mishaps, such as me asking several times in advance if we could check in early and hearing nothing, so we sat at a cafe awkwardly with our bags for hours, then getting a text right at 3 saying that someone had been waiting for us early but had to leave. No serious problems, but it was a bit frustrating.
-The kitchen is small and the ceiling is very low. Not a problem for us at all because there are so many good restaurants in walking distance, but perhaps not the best if you want to cook often.
Overall, well worth the money for the balcony and location!