Great experience.
The place is very close to the metro station which was very convenient as it can be taken to get to/from the airport. Goncalo was awaiting my arrival where I was sincerely and warmly greeted with a tour of the flat, suggestions ( plus a whole box of maps/pamphlets to peruse), fruit and some tarts.
We didn't need to contact Goncalo during our staying except after already leaving as my friend left a bag behind. This was quickly sorted out.
The flat is as described on the site. I would suggest this to anyone without mobility issues as there are many narrow and steep stairs to get to and into the flat. Also, there is a cafe and university which share the flats courtyard which can be a little noisy before midnight if you go to bed early (It didn't disturb us).