Ingrid was a great host - on my first evening she showed me what the locals like to do on Sundays, and she was very well-informed about the local culture, well-known spots to indulge in their delicacies, where to party, etc.
The apartment is well-located in that it is close by downtown Lisbon, and lots of the main squares are walking distance from the apartment. There is also a metro five minutes away.
Being by the by the street though, so it is possible to hear people talking if they are loud enough. The room was clean and comfortable enough thankfully.
Other than that, I had an amazing time in Lisbon, and my host played great a role in me enjoying my stay.