We really enjoyed our stay at Laura & Diogo's place. First, our flight was delayed, yet we were still met at the unit and provided with a walk through of the unit and a very helpful and detailed overview of the area and possible destinations.
The location is great. We did a fair bit of walking, and the location of the unit was perfect. Not too close to the noise and activity, but close enough that after walking a couple blocks you were in the midst of shopping, and in a few more in the middle of Historic Lisbon. The building is older, but the unit itself has clearly been recently renovated. Don't worry about the graffiti in the neighborhood. We always felt safe, and the people and shop owners we encountered were very pleasant and helpful.
The tour books warned us about noise, but we found the location to be quite peaceful. Only once were we roused by noise outside, and in this case it was the cleaners washing down the streets.
Our only issue was mentioned by another comment back in 2018. Specifically that while the unit is all new / renovated, the rest of the building is not. For 2 days of our stay there was an unpleasant odor in the common hallways and in the suite. When I reached out, Laura and Diogo quickly let me know that running the shower periodically would address the issue in the suite as the source was the old pipes in the building itself. Interestingly after a couple days the smell was no longer observed from the shower drain, or in the common hallways.
All in all we enjoyed our time in Lisbon.