Cute old apartment, recently completely remodeled and very stylishly decorated — I think this whole house is apartments like this. It's one of the cutest places we've stayed at, with French balconies with views across the river and the city. The living room has a nice big wooden table, great for doing some work from as well. I think the whole house is apartments remodeled and rented out this way.
João communicates quickly, professionally, and in excellent English. E.g., the apartment was new, so it didn't have clips for hanging clothes, but he very quickly got someone over with that.
It's situated at an amazing location super-close to all attractions (Chiado, Bairro Alto) and restaurants — in fact, it's right on top of an attraction, as the Bica street is the most famous street in Lisbon, featuring a very cute funicular.
Now to some things to be aware of, which arguably also gives the place some character:
The Bica street, while cute during the day, turns into a noisy bar street in the evenings. You'll find beer drinkers sitting drinking on the stairs right outside the house entrance. The windows are well soundproofed, so you can shut out that noise, but as with any old apartment like this, there's going to be noise (footsteps, etc) from people that live above.
The aircon is in the guest bedroom, not the main bedroom.
The place is newly remodeled (June/July 2019) so there'll be some paint fumes for a few weeks at least.
There's no elevator — you have to climb 4 flights of stairs. But this is Lisbon, you'll be climbing stairs and steep hills to go anywhere! :)