There are normally two types of accommodation. The first one looks and feels like rental housing or like a hotel. The second one feels like... home? Marilia's place is one of the perfect examples of the second type - we had stayed there for just two nights but we felt like we were living there for years.
Marilia is a fantastic host, she met us at the door and explained everything you'd need to know about the place.
The location is great, too. The appartment is placed in the town center but a few buildings off the main streets, so you can easily reach any tourist attraction and don't have to suffer crowds and 24/7 trade outside your window.
I should have mentioned the 3rd floor with no elevator, but if you are going to visit Porto you have to be already aware the 3rd floor is the shortest distance you are going to climb at in this town ;)