Wonderful location, very close (2 min) to Praca do Comercio, 5 min to Rua Augusta and many more attractions in the old town center. It is surrounded by a lot of public transport options (metro, tram, busses).
The apartment is located on a small hill, on the 4th floor of a building without an elevator - we appreciated the opportunity of doing some exercise, but if you plan on travelling with a lot of heavy luggage or just don't want to climb stairs on a daily basis, this should be taken into account.
The apartment is located in a chic attic, with wonderful light flowing in all day long (especially in the bathroom) and tasteful furniture & decor. It has all the ammenities you might need (except a washing machine). You can easily prepare your own meals in the apartment or just take a short stroll in search of typical portuguese food as the building is surrounded by lots of restaurants :)
The maintenance of the apartment could be slightly improved to include more consumables (trash bags & dishwashing liquid for example) + some small repairs should be done to take this apartment from good to great.
The communication with our host Carlos was swift and efficient, check in & out was completely automatic, using a code for the building and the apartment.
A downside of this apartment - the noisy neighbors. When we entered the apartment, we read the house rules that stated quiet hours are to be respected. Unfortunately, our downstairs neighbors didn't receive the same set of rules as they were quite noisy on some nights. This wasn't such a big problem as we were equipped with earplugs, but I think this should be discussed with them eventually.
Another problem is that when the downstairs neighbors cooked something (and they did it especially at night), the smell invaded our apartment completely - not sure how it got into the apartment as all the windows were closed. Maybe something can be improved here as well.
Overall, our stay in this apartment was a pleasant one and I would consider coming back.