I stayed in this flat for a month when I first arrived in Lisbon, having moved here from the UK. The flat is perfectly proportioned for a single person or couple with large rooms that are all beautifully sunlit during the day.
Located next to a quiet square, there are plenty of cafes and restaurants within a minute's walk and it's only a short five minute walk to the riverside for a beautiful walk during the day.
The flat is tastefully decorated throughout, feels cosy and has all the amenities that you would need for a short or medium term stay. The only shortcoming I felt was the lack of laundry facilities which meant that I had to go to a local laundrette during my (admittedly long) stay.
Overall I would easily recommend this flat to anyone coming to stay in Lisbon, and indeed I have already recommended it to some friends coming to visit later in the year.