Monica's place is very nice, close to the Dún Laoghaire Harbor and Dalkey town (around 20 min by walk), town centre, stores, good restaurants and supermarkets. The house is in a quiet street, with a good atmosphere.
Monica and your daughter Emma gave us all the instructions to come there ealier, even though the house's rules. My husband and I enjoyed the stay, we have great chats with Monica and others travellers that were there. We recommend her AirBnb.
Ps: there are some narrow stairs to come the attic, so it's good to know because it's a little bit hard to bring heavy and big luggages to there.