Lovely little apartment that's perfect for a stay in Lisbon. The location is as central as it gets which also means there's lots of hiking up hills and stairs - but that's pretty much part of the deal in (central) Lisbon.
We fully enjoyed our stay in this little flat: it was clean and well equipped, and the communication with the hosts went very smoothly.
For information though, the stairs to the flat inside the building are quite narrow and high - so bringing your largest suitcase is maybe not the best option.