We stayed four nights at the Cosy Apartment and can certainly recommend it. Communication was fantastic, location for us was ideal, and the apartment well appointed.
Lisbon has a great bar, cafe and restaurant culture, with the apartment close to all. It is located on the No.28 Tram line, and a 3 minutes walk from the Castle. It is also only a 3€ Uber ride from the centre of the city.
Overall, a great stay