Hi! It is in center of the city and should take you minimum of an hour depending on the time of the day.

Yes they do at least Visa and Mastercard

I would say just before sunset. In that way, you can have both daytime and evening view of Hanoi. During December, the sun is no longer visible around 5:00pm. So if you arrive at 4-4:30pm, you can have a clear view of Hanoi. You can stay for an hour or two until the city lights up and then you can have a nighttime view of the city.

Hi William! The opening hours are 08:30 ~ 23:00 (Ticketing Counter close at 22:00, I suggest going in the evening time where you can catch the sunset and also see the beauty of Hanoi nightlife! For adults (above 12y/o) the price for a ticket will be 230000VND (apprx SGD$14) while for a child the price will be 1700000VND (SGD$10) Hope you will enjoy the place as much as I did! Take note its a distance away from the Old Quarter so plan your time right if you want to catch the sunset or anything! Plus evening traffic is rather crazy so it took longer to get a ride to Lotte Centre

I don't remember the amount but it's not expensive. No need to buy ticket ahead of time.

Yes on the roof the building there is a huge outdoor bar. At night there is a DJ. It's a nice spot.

No you don't need a ticket to the roof top bar. You enter via the Lotte Hotel lobby and get the lift to the 63rd floor. You generally done need a reservation but it might be a good idea if you are having dinner there.

hello, in the day time a student ticket is 170,000 vnd and at nighttime 110,000 vnd