Unfortunately its all non smoking.
It's non-smoking in the rooms. However, you can smoke in the rooftop bar/restaurant and even have ashtrays at the elevators although, for other guests' comfort, I just went to the bar or out on the street. If you like Vietnamese Iced Coffee, there is a little shop 2 or 3 doors down to the left when you leave the hotel and you just sit out the front in the little chairs and enjoy the scenery.
Get an answer from Gondola Hotel staff and past guests.