Brian and Jules' place is absolutely excellent and deserves nothing but praise. The room I stayed in was immaculately clean and comfortable, and both hosts were highly accommodating to any needs that arose. For any future trips that I may take to Dublin, I will absolutely return here without hesitation.
In terms of location, Dun Laoghaire is a lovely small suburb that is packed to the brim with shops, cafes, and restaurants to visit. It's also very well-serviced by public transportation, so you will never feel like you're too far away from anything.
In short, if you're seeking a place to stay as a solo traveler, please don't hesitate in booking Brian and Jules' place. Best of all, you'll be supporting hosts who actually reside in their home rather than a faceless private equity organization.