We stayed in Sean's apartment for 4 nights and we enjoyed every moment.
It is indeed located a walking distance from some of Dublin's attractions (Dublinia, The Guinness storehouse and Dublin Castle).
We were 2 adults and 2 kids and we only used public transportation for one day (to carry all the shopping bags 😄).
Like others mentioned before, Sean was very responsive and attentive. He offered his assistance with anything we needed - directions, tips and even fixing the internet.
We would recommend Sean's place in a heartbeat and will make sure anyone who asks us for a great place to stay in Dublin will check Sean's place first.