Hi Dawn, I love your posts, and here are my 2 cents:

Half a year ago, I stayed at Hilton Vienna Am Stadtpark, 2 nights on reward and as HH Gold was upgraded to executive with lounge access. The lounge is very nice, the staff throughout very helpful. The hotel is in a great location. CAT (City Airport Train) stops almost next door, is very efficient and costs only 9 euro or less if bought online in advance.

Our chief of audit (a gentleman of certain age and his wife, both with slight mobility limitations) is doing VIE & PRG in two weeks. He did lots of research and asked me about PRG and CZ since I was born there and go frequently. He is also taking a first class train to PRG from VIE.

There are many nice hotels in PRG. They have Marriot as well. I could also recommend a very qualified and reliable guide in Prague (a Czech Canadian now back to PRG) for a private tour, PM me if interested.

Bon voyage!