The views are incredible, you can see the Tagus, Santa Justa Lift, Bairro Alto neighborhood. Being in the Alfama neighborhood. The windows swing open and you can take a tiny step outside to enjoy the breeze. At night there is faint chatter from all the alleys below; quite romantic. If you close windows you don't hear anything. Being the entire top floor we had two different guests below and did not hear them at all.
In terms of location it is ~7 min from the metro stations (Rossio, Matim-Moniz) and is barely tucked away east from the busy streets of Baixa district. That leaves a little bit of elevation to get to the apartment, but still ends up being very close to transportation without being in the thick of it.
The only downsides is that this place gets booked a lot and it seems some guests may have abused some of the IKEA furniture (note that everything is from IKEA). Also being on the top floor the ceiling/roof slopes downwards so half the room is not standable (you see a lot of signs of previous guests bumping into the ceiling).
All in all you come here for the views and to relax from the high energy of Lisbon.