Hi! I found myself staying in a couple of private albergues on the Finisterre route last year, which were very nice but a bit more expensive than on the Frances - around 12 Euros per night rather than 7 or 8 Euros. If you plan towards the top end of the daily estimates quoted on the forum you should be fine. I can't think of any additional costs apart from the bus back to Santiago (if required). That was about 12 Euros from Finisterre. Buen Camino!