The apartment is nice and clean. There is a washing machine and decent wifi. The kitchen is pretty big for the apartment, but the bathroom is tiny. There's no door so there's little privacy. It's not that someone can watch you use the toilet, but not having that barrier is kind of odd. I didn't think it would bother me, but it was very strange.
The hosts are very agreeable and nice. We asked to keep our bags in the apartment a little later and they agreed. They were accommodating.
The biggest drawback would be the location. It was very central and near Rossio as promised. It was also quiet and surrounded by some restaurants like Indian and nepalese so it might be a good choice for vegetarians. But all the restaurants were kind of holes in the wall and I can't attest to their quality, though Roman said the Portuguese restaurant with Minha cuisine was good.
The area was very quiet almost too quiet, especially for the amount of people on the street. We never had a problem, but there were some sketchy people around and we passed a lot of shabby ground floor apartments with makeshift kitchens, the doorways draped in cloth and dimly lit as if there was no electricity. Across the street was a bunch of dirty old mattresses and garbage with feral cats lying on them. It must have been for garbage day, but they stayed there for a few days. There were always a lot of men around, gathering in the minimarket or on the street. Thankfully, I didn't understand anything they said. My boyfriend said they were "interesting", apparently one man was giving a lecture to a group of other guys about how one day he was going to set everything and everyone on fire. I saw a woman walking alone and a man followed her, and tried to hold her hand. She seemed to be unphased, by the harassment as he kept walking the same way as her.
Overall, the apartment itself was nice, clean, and modern, but it seemed to be almost an island set amongst the other apartments. I would not walk there alone especially if you don't speak Portuguese.