Antonio is a veny nice host. He has been very nice and easy to communicate with. He was very flexible and made himself available to welcome me at quite a late time in the evening.
Regarding the apt :
It's really well located, in the heart of Lisbon, close to the cool bars and restaurants, close to amazing view points and close to transportations.
The street is very quite which is also a plus.
On the downsides, the pictures are a little overselling the apt as the ceiling being very low, there is not much light in the apt. The bedroom is also smaller than what you can guess from the pictures.
That said, the apt is very clean and comfortable (if you're not too tall).