I visited Hanoi during April and May, staying in a hotel in the old quarters. The Old Quarters are a busy place in Hanoi! If you opt for a more tranquil part of the city the French Quarters might suits you better? It´s very interesting to walk around the Old Quarters, but you will quite easily get lost in the myriads of narrow alleys, in between the bigger streets. However getting lost is part of the fun and also necessary to see some of hidden family life of the narrow alleys in Hanoi.