I would highly recommend staying at Claudia's place. The home and room are spacious and have traditional features like high ceilings. The neighborhood is not touristy, is flatter than most of Lisbon, and felt very safe. If you stay in the winter, there is an electric space heater you can use in the room. The room also has a large wooden desk that is great for working. The bathroom is shared only with up to one other guest. The highlight of the place though is the interaction with Claudia and her family. They're extremely kind and friendly people and I had many interesting conversations with them. Claudia also went out of her way to resolve an issue I encountered - it was much appreciated!