Siobhan is a great host - friendly, energetic, very helpful in terms of places to go (those printouts she has for the newcomers are brilliant).
The house is a bit far from the centre, about half hour walk (which is not a problem at all if you can handle busses or enjoy walking), but the area is nice and quiet. The whole place is clean and comfortable and nicely decorated (most of all I enjoyed the pictures of Elvis in the bathroom:) ).
Me and my husband had a great stay at Siobhan's place! My definite 100% recommendation to every traveller in Galway.