The hotel that I booked and had 2 confirmed cases informed me that they cannot take in bookings from 8 Mar till May and said I can approach Agoda to cancel free of charge. I have done that. If I can get my money back, I am likely to cancel my trip.
For info, Vietnam is very serious and detailed from the information available online. E.g it stopped flights to and from China and South Korea, its 2 biggest trading partners. The contact tracing is thorough from the website and it ordered the hotel to stop bookings to minimise risk. It stopped visa exemptions from many European countries and any countries with more than 50 new cases in a day or more than 500 cases accumulated. Socialist countries really TOP form when it comes to controls and measures to contain the virus.
If you can go to places like Danang now, I am sure the amusement Parks will be quite empty and you can get good bargains shopping there, since Chinese, Koreans japanese, Europeans all gone....but well, I have work commitments and we do not know what will happen on the 2 leg of flights....