We were in Lisbon for four days in late-October, we stayed in Martin's apartment and we found it really charming. The place is small (as every apartment in the city center) but well distributed and very comfortable, its inside balcony has plenty of space to sit and zip a cup of coffee while appreciate how people live in Lisbon, and the outside balcony being small allows you to have beautiful views of life in the street. It has the added convenience of having an elevator and the host was kind enough to leave plenty of items for daily cooking and breakfast. We really enjoyed our stay in Lisbon.