The appartment is nice with a good kitchen, modern bathroom and cozy beds. The location is perfect. It's very close to Rossio and Bairro Alto.
However, what you should know is that this appartment doesn't belong to a private owner. It seems like it belongs to a big Investor, who owns many appartments in Lissabon and manages them from an office. I received plenty of mails before our stay and had to do an online check in on an external website.
All in all, the appartment is nice, but you should not expect the typical personal Airbnb experience, rather like a hotel.