We stayed for 6 days in Lisbon and enjoyed every single one of them. The apartment is perfectly located in the old city, surrounded by a lot of nice bars and restaurants. A decently stocked supermarket is just around the corner. The only thing to consider: Don't forget to pack your sneakers - sooo many hills and stairs :)
The apartment itself is on the 3 floor, clean and nicely furnished - great for a couple. Eva handed us over the keys on the first day and gave us some nice suggestions for the days.
We would highly recommend this place and come back in the future.