Mixed experience here -
Location 5 stars, very central but nice and quiet
Space, 5 stars, nice big living room, could have had 4 people there with no problem
Amenities, 2 stars, internet didn't work most of the time, electricity was faulty so you had to switch other appliances off when boiling the kettle to avoid tripping the fuse, and although there was an oil radiator this didn't heat the flat very well. Okay in the summer I guess, not in February.
Kitchen set up, 4 stars, could have done with a sharp knife and a grater, and maybe some new pans. But good otherwise
Welcome, 1 star, host didn't turn up on time, and I would have been stuck in the street if the neighbours hadn't taken pity on me. I had a problem with calling a Portuguese number when I got there, but the host didn't respond to email or to her neighbours calling her, so I was unable to get in the flat for quite a while, which was pretty upsetting
Great if you just want a base in central Lisbon for going out, but avoid if you want to stay in or do work online.