We had a great stay!
The host was really helpful and had arranged that a friend would meet us inside the apartment at our time of arrival. She took the time to explain everything and gave us useful information about the facilities in the area, transit, shops, and Dublin nightlife recommendations. Also, there are plenty leaflets in the flat, and a guidebook, which helps when you're a Dublin first timer.
The flat location is perfect, a 5 to 10 minute walk to everything, really: Dublin's nightlife, town center, river, Trinity College, Grafton street, Temple Bar, O'Connell Street. There are plenty shops nearby for food shopping. The airport bus stops are less than 10 minutes away, and the Dart Pearse station is really close.
Wifi works great, the beds were comfortable (having a bad back, I know what I'm talking about!). The flat is modern and well equipped.
The host remained available throughout the stay if we had any questions (which we didn't, really, everything was clear from the start).
Definitely a place to recommend and come back to!