Hi! I did a 2 week trip along Vietnam a few years back. Was at Saigon (HCM), Mui Ne, Nha Trang and of course Hanoi. In Hanoi, we stayed at Golden Sun Palace Hotel. It is located smack in the middle of Old Hanoi with plenty of restaurants flanking the streets around the hotel. Loads of tourist attractions nearby like the cathedral, museums etc. Me and my friends booked the standard rooms but the family suite is said to be able to house a family of 5 comfortably :) https://www.hotelscombined.com/Hotel/Golden_Sun_Palace.htm
You can consider Army Hotel. Read good reviews about it. Has a nice big pool, family rooms and two-bedroom suites available if I'm not mistaken. It is near tourist attractions such as the National Museum of Vietnamese History and the Hanoi Opera House. http://armyhotel.com.vn/
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