Avenida Boutique Apartments II is on the first floor (European 1st floor) so there are not too many stairs but also the view is not as good as the views shown in the pictures on AirBnB. The apartment is very, very comfortable with a good amount of light and lots of places to sit. It is aesthetically very pleasing--although sometimes it is form instead of function.
The beds are also very comfortable and there is lots of hot water. It was VERY cold in the apartment when we arrived (13 degrees...) but once we figured out how to turn the heaters on (by pushing the emergency shut off switch on each floor unit!) --the apartment heated up quite quickly.
The WiFi is frustrating. It works fine and then every 15 minutes or so it glitches and doesn't work for a few minutes. the it comes back on again. So be aware of that.
There can be street noise-- like cars going by (which didn't bother us), but the singing drunk people when the bars close did awaken us since they seemed in the room even with the windows closed! Luckily--there were some good singers;-). Location is great--up to Principe Real, easy stroll to Chiado, or down to Liberdade. And to have the mini mercado across the street--even open Christmas Day!-- was very helpful to keep us stocked in the basics.
We would definitely stay there again--preferably on one of the higher floor apartments (although the stairs are quite narrow and can be slippery since it was raining). And we really appreciated Davide and the others who were responsive, let us check in early, and understood when we left later than planned. THANK you!!