I lived in this apartment for a longer period and can only recommend to anyone to stay there when in Lisbon. Overall, three points make this apartment stand out:
1) Location: Perfect location in the heart of Chiado (next to Bairro Alto), thus perfectly located to get to the best restaurants, bars, and activities in town. Luckily, even though at the center, the apartment is located in a very calm street.
2) Hosts: The family owning and managing the apartment is outstanding. They are super friendly and eager to help you out in any situation. If we faced any problem in the apartment (which luckily did not happen very often), they found a solution right away. I remember that I complained on the day of moving in that the wifi signal was not evenly distributed in all rooms. The next day, the hosts already provided us with an additional repeater. So impressive! Moreover, they have also been very helpful with other issues we faced while settling in. Overall, we were really impressed by the kind of hospitality they offered.
3) Apartment: The apartment has everything you need, the kitchen is well-equipped, the internet works perfectly fine (and is fast), and the shower is super nice as well. Also, the apartment is nicely decorated and cozy.
Overall, I can only recommend to book this place for you trip to Lisbon - be it for leisure or business, for short-term or long-term!