We spent one week in this apartment and I strongly recommend it.
The location is extremely central and easy to access by metro. The tram 28 stop is right by the door and there are always taxis passing by in the street.
And although it is right between two of the neighbourhoods with most lively nightlife in Lisbon (Bairro Alto and Bica), it was quiet inside. The bedroom is not towards the street, so we managed to get a good night sleep even in Santo António, the busiest and most chaotic night of the year in Lisbon.
It was very practical to live so close to a supermarket and a good fruit store. The pastries on the cafe next door are also highly recommended.
The flat was nicely renovated and it had everything we needed. It was bliss to come home and be able to turn on the air conditioned on the days when the temperature outside rose above 30C.
I had to work during my stay and the wi-fi internet proved to be quite fast and reliable.
Pedro and Antonio were very easy to communicate with and we felt very welcome. I will surely recommend this apartment to my friends.
Although, that wasn't a problem for us, our only remark is: this is an old building with very narrow and steep stairs and the apartment is on the 4th floor.