We're three Italian girls and Antonio's apartment was exactly what we were looking for our week in Lisbon . Antonio is a perfect host: his answers to our questions have been always quick and detailed, his helpfulness is unlimited and his welcome were definitely nice (he showed us the apartment and gave us a lot of suggestions about places to visit in Lisbon).
About apartment, I really can't find anything negative to say: it's located in Bairro Alto, a central district plenty of shops and restaurants, but it's in a little street, quite far from traffic and crowded places. Furniture is new and very nice, everything is perfect and clean. I think it's a situation suitable for groups of friends, couples and even families.
So I really recommend you to choose Antonio's apartment for your stay in Lisbon, because you feel right at home there!
We look forward to coming back as soon as possible!