Overall an enjoyable stay. We didn't spend too much time in the flat itself, as we wanted to see as much as possible in Dublin.
Like many people wrote, it's pretty loud so get some earplugs if you're not used to the noise. Me and my husband are used to quiet nights, but my two friends were used to the noise and it didn't disturb them much.
Shower pressure is horrible, we had to squat or sit in order to shower properly. If the shower head is hanged too high, the water stops flowing completely.
Apart from these two mildly annoying things, it's a very nice flat and we enjoyed our stay there. It's perfect for two couples travelling together. Some snacks were left for, which was very nice. Great connection to the airport.