You can not pick a better location. In less than a ten minute walk, you will be in the heart of Lisbon. In less than a 15 minute walk you can be at San Jorge Castle or at the Santa Justa lift.
The apartment is very spacious and the bed is very comfortable. Check in was a very easy process with someone meeting us at the apartment with the keys and paperwork. The only issue we had is by giving the address to a taxi driver at the airport they took us to a location that was absolutely not the apartment. I would recommend either taking a car service that the host can set up, taking an uber or giving the address of the square that is right in front of the apartment.
We were pleasantly surprised by the lack of noise from the street!
I can not recommend this apartment more, and will suggest it to all of our friends when they visit Lisbon.