I was basing myself in Killarney for 5 nights on vacation while exploring the area nearby. Liam's place was very convenient for me. It is just about a 10-15 minute walk from anywhere in Killarney city center (bus station, train station, tour bus pickups, restaurants, pubs, etc). The entrance to Killarney National Park is also only about 15 minutes. You could walk to Ross Castle in about 45 minutes.
The house is in a quiet neighborhood and kept very clean.
Liam was a fantastic and friendly host. He picked me up from the bus station and drove me around town to show points of interest, and dropped me off at the train station when I left. He even dropped me off at a trail head one morning when I was going hiking! He was also a great source of advice in general about what to do and how to get around. I can't say enough about the hospitality.