Pros:
The apartment itself is super clean and conveniently located in the centre of Lisbon. There are plenty of restaurants, bars and shops close by. It is on a charming cobbled street within walking distance of all transport.
Cons:
The only quibble I had during my stay was the amount of noise that comes through ceiling floorboards; they seem paper thin and I could hear every footstep and even full conversations. The booking company did try and address the situation with my upstairs neighbours to no avail. I may have been particularly unlucky with these people, who walked about and scraped furniture until 12.30pm, and you may have no problem. It’s worth noting in case you have children or are an early sleeper that this may disturb your stay.