My husband and I just went to Hoi An earlier this month and in Hai Au. From the personal point of view of the husband and wife, the guesthouse is very clean, the breakfast buffet is very rich and delicious. Just about every spouse is Vietnamese, the rest are foreigners, so if they are Vietnamese, they need to be asked. Hai Au is a bit short on this, besides the location is also near Cua Dai beach, far away from the center, bike riding all but the butt.