Marc's apartment has proved to be a great choice. It is located on the first floor of a central historical building with an azulejos facade, the Portuguese painted tin-glazed ceramic tilework.
I have never met Marc. Nevertheless, I received a very welcoming email minutes after booking on Airbnb, followed up by another email providing detailed directions.
Once in Lisboa, I was welcomed by Helga, a lovely and thorough Portuguese lady who gave us plenty of tips regarding places to go, where to eat and much more. The apartment was spotless and contemporary as it was completely refurbished a year ago and it comes with all mod cons from a weighting scale in the bathroom to 2 types of coffee machines in the kitchen. It really feels like staying in somebody's house.
The apt is located close to a metro station, local bars and restaurants, fruit shops and supermarkets.
I would definitely recommend Marc's apartment for your next trip to Lisboa!