We very much enjoyed our stay at Liliana and Tomás's apartment. It is perfectly situated in the very heart of Baixa.
Tomás met us very promptly at the apartment and was extremely helpful, letting us leave our bags until late on the last day. The apartment is well furnished and equipped - my only point would be that if 6 people are staying, you better be on good terms, as if staying in one of the bedrooms you will need to go through another one in order to get to the bathrooms!