This was a great place to stay. We did not meet Christian but the communication was fast and accurate.
The apartment is next to the Guiness Storehouse (5min walk) and some 25-30min walk to the city centre. There is also a bus station right infront of the building. We also used a couple of supermarkets which are some 500m from the apartment.
It was nice and clean and we have no complaints so we would recommend this place if you are looking for good value.