I stayed at Susan's apartment for 11 nights. Excellent communication from Susan throughout, she was very helpful. The apartment itself is superb, it was absolutly spotless and has everything you would need for a short or long stay. The kitchen in particular is very well equipped. There are 2 balconies so if you are lucky with the weather you can sit out in the sun at pretty much anytime of the day.
I also had to work remotely for 5 days so it was important for me that the wifi was of a good standard and there was absolutely no problem with doing TEAMS calls etc it was very good.
Milltown is a really quiet area , no noise whatsoever at night and a really nice area to stay in. The LUAS is very close , Susan will give you a key to get through the gate that leads to the station and on the other side you can get buses very easily. I did a fair bit of walking and you can get into the city centre in under an hour. I tended to go out in Ranelagh which has some really nice restaurants (recommended by Susan) and its only a 20-25 minute walk or 3 stops on the LUAS.
Would highly recommend staying at this apartment if you are in Dublin.