My wife and I will be in Prague for a few days the beginning of October.
Here is a little background information.

We are both in our mid 50's, and love Europe's "old charm"
Wife uses a mobility scooter, and I walk moderately well.
because of the scooter, we usually hire cabs instead of subway
We are Hilton Diamond, and do appreciate the exec lounges.

Having said that... which Hilton in Prague would be best?
and should we stay for 3 nights or 4?
We will be moving on to Vienna, and then Paris for the rest of our 2 week European holiday, so if anyone has similar suggestions for Vienna I would love to hear them.

Thank in advance.