Ten of us have spent the week running on the Welsh Coast Path and the house was great and in the perfect location.
House - Great layout downstairs with plenty of space in the downstairs rooms to cope with the 10 of us all milling about. Good sized kitchen with plenty of crockery/cutlery. Two sitting rooms with TV's (one with DVD player and plenty of DVD's) and a dining room gave good flexibility for evening activity. Small utility room with washer/dryer was great for dirty clothes/shoes at end of the day. Upstairs the bedrooms are large, smart, clean and well laid out and with three showers there was never a queue.
Location - just off the central square means everywhere in town is walkable. Nice pubs, nice meals in The Ship Hotel and Lemon Grass indian restaurant. Decent sized Co-Op but also great butchers / greengrocers in the square. Large park with riverside walk (and parkrun). Dolgellau is a main hub for buses in the region and it was easy for us to get to and from the Coast Path each day. As I write, Traws Cymru buses are free on weekends as well. Whilst we didn't walk inland, Cadair Idris can be walked from Dolgellau.
I would thoroughly recommend the house and the town for a holiday base