Stayed at Mario's place for one night - Mario met me once I arrived and gave tips on what to do and how to get to the city center (which is very close by foot...). He also gave me great tip about how to get to the airport with a taxi on very low fare.
He also had no problem for late check-out which was great help for me.

The apartment is definitely recommended and if I (hopefully) get back to Edinburgh, I'll sure want to stay there.