In the end we decided on this hotel, which accepts children in a double room at no extra cost. The rooms are spacious, with a small sofa bed for the kids. There's a public bus stop nearby, where you can travel to the airport. The service was faultless, but we didn't have breakfast at the hotel because it was expensive. There's a bar in front with great prices. Right next door there are two supermarkets where you can do shopping for necessities. Quite well located, not too central, but in quiet location, close to Parnell Square and O'Connell Street.