I stayed twice at Authentic Hanoi Homestay within two weeks, leaving my luggage there in between stays. It is, ideally, right on the edge of the 'action', and within walking distance of the lake, the French Quarter and the Ba Dinh district (Ho Chi Minh Mausoleum, etc). The manager, Mr Kevin, is very friendly and helpful, as are his staff (mostly student part-timers I think). The breakfasts are simple but entirely sufficient. Where the homestay fails is in its condition. While the rooms are okay, the ensuite bathrooms and kitchenette are in very poor condition - they need serious renovation and - after it - much greater attention to cleaning.