Maria is a very nice and helpful host. She answers all of your questions very fast. The apartment is nice and clean with a practical small kitchen and a code lock on the door.
The apartment is situated well if you're in Lisbon for the first time. You can walk everywhere and it's very close to all kinds of public transport. The problem is that it's ALSO in the middle of the busiest, most touristy streets in the city. The apartment has no aircondition and you can not have the window/balcony door open because of the noise from the street. Trams, buses and people are passing all night long. In addition to that there's a restaurant on the ground floor that starts very early (around 7 am) to fry meat, and the smell is almost unbearable, also when the windows are closed. Because of all this I would have chosen another place to stay if I could choose.