Lisbon is one of the cities in which AirBnB takes over the best areas and you need to watch out not to be part of increasing rents and living costs for locals.
Staying with Paula ensured that a spare room was used efficiently, like the original concept of AirBnB. She seems like a true family person and is great at inviting strangers to her home. Her son's room is now used for guests.
The room was very basic, and that wasn't unexpected. It was exceptionally clean. That's all you need as the city offers so much to walk and explore. The famous tram 28 is just around the corner.
The walls are quite thin, and I'm sure this is nothing unusual in Lisbon. Bring earplugs if you're a light sleeper like I am and you'll be grand. The house is quiet overall. It was a good place to stay, I would do it again anytime!