Where to stay

Best price: Rising dragon hotel
Rising dragon hotel is located at Hang Be Street, just minutes walking away to Hoan Kiem Lake. From the hotel, it takes 20minutes walk/10minutes drive to Ho Chi Minh mausoleum and many other centre attraction. The staff is knowledgeable and helpful with all your requests. The hotel was newly renovated in 2009 with 35 rooms in total. The standard room costs around $20++ while the Family suite costs around $40++. All price includes breakfast and free wifi access from both common place and in room. 
Best for business: Essence Hotel
Essence hotel is just 2 minutes walk from Hoan Kiem Lake. It is on Ta Hien Street, a bustling street with bars and pubs, perfect for a night out chill after a long day, especially for business traveler. The hotel has a business center which provides printing and faxing service. Furthermore, a meeting room and function area is also available. Daily newspaper is provided. The staff are well-trained and professional, making sure all guests are as comfortable as possible. The hotel was designed in a boutique like style, with modern facilities and traditional Vietnamese designs touch. It costs from $60 to stay there.
Most luxurious: Hanoi Tirant hotel
In the Old Quarters, it is almost impossible to find a hotel as spacious and luxurious as Hanoi Tirant hotel. There is a total of 65 rooms with 5 different rooms’ types from Standard to Grand Suite. The grand suite is 450 sq ft with a beautiful view of Hoan Kiem Lake. The hotel has restaurant and bar at the 9th floor so guests can have a panoramic view of the city. There is also a gym and swimming pool inside the hotel. A function hall is available for business needs. Those located right in the middle of the old quarter, the rooms are quiet and a peaceful retreat. 
Best for family: Elegance Ruby Hotel
Elegance Ruby hotel is right at the middle of the Old Quarter, on Yen Thai street. From the hotel, guests can walk to Hoan Kiem Lake in just 3 minutes. The boutique style hotel provides impeccable service by the staff who is always attentive to your smallest need. All rooms are well furnished, having a warm and homely feel. Though right in the middle of the busy area, the rooms are very quiet and secluded, perfect for relaxing. There is an elevator, free wifi and additional service such as baby cot or extra bed.
Best for couples: Hanoi Elite Hotel
Hanoi Elite Hotel provides 12 en-suite guest rooms that provide cosmopolitans elegance. All rooms are warm and modernly designs with wooden furniture. The hotel provides tour information and booking to Hanoi and nearby attraction places. Visa service is also available. The rooms are private and noise free with sound proof windows. The price starts from $45++/