The apartment on Parliament Street is in a very good location to see all of Dublin. Just a short walk from the Grattan Bridge, you are near everything you need to be near. I would suggest one of the free walking tours that are offered - there is one that meets at 11 every morning in the Temple Bar Square.
The apartment is no frills, and the bathroom is very small - but it's comfortable enough after a day of walking. I didn't find it too noisy - but I aways sleep with earplugs. You can have access to an additional fold out bed if needed. There is a coffee maker, microwave and a small fridge. No toaster. Niall and Gavin were available when I needed them, and very kind.