The Good:
First things first, Cristina & Horacio send us an Email with a lot of tips where to go and what to see. The flat is good to reach from the airport and in a beautiful area of the city. It was easy to get around in Lisbon and see all the sights. The flat was clean and in a good shape, it provides all you need for a nice stay. The only thing not meeting or expectations was the balcony / patio. (more later). The supermarket is very close.
The Bad:
Cristina & Horacio were on holiday so they used the service provided by "The Lisbon Concierge" to welcome us. It turned out to be really bad. At first we received our key about an hour too late and then they wanted to kick us out more than an hour before check out. So if you ever encounter "The Lisbon Concierge" be aware of the fact that there might be some obstacles.
...and the Ugly:
As I pointed out the flat was nice, but the neighbours were not very welcoming. A guy sitting in the patio, half naked and smoking. It really makes the Patio unusable if you have this guy staring at you the moment you open up a window. The flat is in the ground floor so it's not possible to keep the windows unattended open at the street side.