What a lovely experience! I was received by Patrícia in their spacious but cosy studio, in a lovely quiet location, with all the necessary amenities necessary to make your stay nice and comfortable.
Less than 10 minutes from the underground (at the top of Lisbon's main artery, Av. da Liberdade), nice little delis nearby and open late, a couple of nice restaurants (a Lebanese and a Pizzeria) a few patisseries within walking distance. A taxi ride downtown, around €7, a bargain. I would stay there again, without a doubt. Finally, both Patrícia and Arthur are a lovely couple, helpful (had an issue with the internet and Arthur lent his expertise immediately) and chatty.

All in all, highly recommended.

P.S.: And, as someone wrote here, the story about how the original café (which I actually knew many years ago) came to be transformed in 2 lovely flats, is really interesting :-).