In short: great apartment, perfect location, and Francesco and Marta were very, very kind.
They explained very well how to get from the airport to their apartment. We met Francesco first, and he showed us the apartment. In the evening we met Marta, and we talked a bit longer with her. She also recommended some things we could do during the week.
The locations of the apartment was perfect for us. The tram station was only a 2 minute walk. A lot of great pubs and restaurants are located at Smithfield Square.
We would absolutely recommend this place and we enjoyed our week in Dublin!