We stayed for 4 days at Denis' place, which is exactly as described and as you see on the website. It has pretty much anything you might need for your stay and is very warm and comfortable. It is about a 20 - 30 min walk from the centre of town, depending on your speed. There is also a bus stop nearby.
Denis himself was very welcoming, both when we first arrived and throughout our stay - I received a text most days asking if everything was OK and if we needed his help to set up the fire (we took him up on this offer on the first night so that we could relax in front of the cosy fire after a chilly walk to Phoenix Park!).
The flat also has a welcome pack which is filled with maps, takeaway menus, information leaflets and just general bits and bobs you will find useful in helping you to plan your stay. Denis had also helpfully prepared a map for us showing all the nearby points of interest which he talked us through when we first arrived.
All in all Denis is a wonderful host and we really enjoyed our stay!