The apartment has a lovely light and modern interior. It's spacious and well equipped, extremely clean and has a real sense of style.
Yes it's 4 floors up (it's a traditional building of character), but from the open plan living space you are rewarded with wide open views across the neighbourhood, towards the bridge and river. This connection with the city was a big part of why I enjoyed this apartment... it was somewhere I wanted to spend time.
The apartment is on the south-western edge of the Bairro Alto, and easily accessible to its many restaurants, bars and attractions. It's about a 10-15 minute walk to the very centre of the city. Do be prepared for some steep walks into Bairro Alto, but that is the nature and charm of Lisbon!
Mariana was a perfect host. I'd made the booking while in Lisbon at extremely short notice, but she gave me flexibility for checking in, made sure I was comfortable from the moment I arrived, and kept in regular contact throughout my stay. There is nothing I could fault!
I would whole-heartedly recommend the apartment, and Mariana as a welcoming host.