Old and French Quarters
Walk lanes and reach bia hơi at night: Old Quarter (noisy, narrow). Quieter Opera / Trang Tien / Hoa Lo: French Quarter. Both can walk the lake by day — do not also chase West Lake night cafés the same evening.
West Lake and Ba Dinh
Sleeping at West Lake means staying on the lake — Old Quarter binges burn the transfer. Ba Dinh helps a mausoleum morning; skip Beer Street that evening. South / station helps trains and Literature temple; nightlife needs a ride. No rates or booking here — pick the axis, then the house.