Julia and Elquisson are some of my fav airbnb hosts to date. Super communicative, responsive, accommodating, and nice.
The apartment itself is clean, central. It's also conveniently located right next to a mini-market. Walking distance to Praco do comercio, as well as Metro.
You may want to look at the many rooms available in the apartment. Apparently there are several listings, but I had only seen the one with the most reviews! All very good options.