A perfect location in Graca, a jolly hipster district away from most (well at least most obnoxious) tourists.
Apartment worked well, however the wifi quality and speed was absurdly bad. I had to get a 4G sim to be able to work.
Additionally the noises of the night are not to be discounted. Constant sound of dogs barking, neighbours chatting. The neighbors even had a BBQ once where smell of smoke filled the bedroom.
Had to sleep with earbuds each time, but that is quite common in Lisbon.