The marina there is terrible if you're living on board - As you said, toilets etc were definitely an afterthought (or just choppered in!). Also if I remember correctly, the visitor berths are a mile away from land, and it was expensive. The Sanxenxo marina about 20nm into the Rias was brand new and less than half the price, and may have had the best toilets I've seen so far! The anchorage in Bayona ok though...