flightrisk

i dont know how much time you have but i can hardly imagin that 2 days are enough to visit vienna - especially if you count in that you arrive one day and leve the next
i would suggest you to sat between 3 and 4 days in my beautiful hometown. If you d' like i might try to help you planning your stay in vienna.
becouse of the railway - i have been in prague quite a few times in recent months and allways travelled by train - the direct train from prague to vienna takes around 4 h - maybe 3 1/2 - and its quite ok - time passes by quickly - at least it did on most of my rides. It makes harldly any sence to fly between the two cities as this would take much longer that the railway

sincerly
max

ps: if you would need any informatin about vienna i would be glad to help