Flat has very good location. With heavy luggages it would be a bit tiring to go by a walk but after check-in you realize that it was a good joice. Panoramic view of Lisbon is amazing. Flat has evything what is necessary for short or longer stay. Full equipped kitchen, cosy balcony, comfortable bed in sleeping room.
Only one disadvantage during winter period is lack of central heating system in flat. There are two electric heaters but in some part of flat is cold. Also keep in mind that heaters use a lot of energy, so if you plan use the oven or washing machine in the same time, electricity could be switched of. Fortunately electricity control is in flat, so it's easy to switch it in back.
In general I really recommend this place.