Vienna Krakow Budapest Prague Warsaw etc
1. Dinner attire in restaurants?
2. All USA credit cards accepted?
3. ANY DON'T MISS RESTAURANTS IN THE CITIES ABOVE? (Any/all price points) Scenic...unusual...fun places????
4. We are looking for a mobile phone App that will translate our English phrases to the language needed while in a particular place.
'THANK YOU VERY, VERY MUCH FOR YOUR TIME!

1- Dinner attire like all of Europe is just like home and unless fancy restaurants casual attire just fine.

2- Discover Cards not accepted in Europe - VISA - MC nearly everywhere - what exact ones do you have - ATMs good way for getting cash - best way.

Going by train or car - if going to cities mainly go by train - cars and cities don't mix one and public transit so so good. Trains are good on main lines - book tickets ahead can mean nice discounts but you might also look at Eastern European Railpass that covers all those countries and lets you board many trains anytime so now booking in stone (discounted tickets often train-specific and sold in limited numbers so should be booked as early as allowed - often up to 2 months in advance - great booking info - www.seat61.com tells everything you need to know about that - general info BETS-European Rail Experts and www.ricksteves.com. If planning on driving reconsider that as you indicate you're just going to cities mainly.

There are also overnight trains between some of those cities that saves daylight travel time over long distances.

And how long do you have for this?

1. Attire is generally required in restaurants. As PalenQ noted, casual attire will be perfectly acceptable for most restaurants, but MOST restaurants aren't ALL restaurants.

2. AMEX is of limited use in much of Europe.

3. USING ALL CAPS IS THE INTERNET EQUIVALENT OF SCREAMING! Please don't. Sorry I can't answer your actual question.

4. Underlining every word is also unnecessary. And again, I can't answer this question.

I would note that if the guide book(s) you are using doesn't/don't provide answers to questions like these, then I would strongly encourage you to get better ones.

4. What is wrong with Google Translate? Not that you will have much need for anything other than English in those cities, always depending on the etc.

For Vienna...

1. Attire will depend on the visitor, the restaurant and the location. In general, Viennese tend to dress nicer, even to go to the grocer. Within the Inner Stadt and touristed areas, pretty much everything goes, regrettably, in all but the higher end restaurants. Hiking attire and biking clothing is not uncommon in heurigers. Trachten is welcome everywhere.

2. Cash is still preferred in many Vienna restaurants; outside of the touristy wine taverns cash is the only accepted form of payment at heurigers. Visa is much more accepted than MC, but don't be surprised if a restaurant staff claims the "machine is broken" and asks if you can pay in cash.

3. Any guide book will have a list of "Must Do" restaurants. In Vienna, a heuriger evening in September would be lovely.

4. Google Translate. But, how will you translate a spoken response?

Actually at least on Android Google translate can handle voice. You just need to click on voice or conversation

I am chuckling at the notion of a Viennese being patient enough to wait for a traveler to translate a conversation. 😂 I shall now be on the lookout for this phenomenon.

It's actually pretty quick.

Hey the Germans put up with it

I dress the same way in those cities for dinner as I do at home, for equivalent level restaurants.

Amex is not of limited use in much of Europe. I've been surprised how commonly accepted it is in many places, actually, even smaller restaurants. I always take that card just in case, even if I don't usually use it as the type I have has a foreign exchange 2% charge, and my main cards do not. But they do have good customer service and once I was really glad as both the Visa and MC networks were down for some reason for hours in a city where I was (all of that part of Europe, probably), but Amex could be used.

But yes, of course USA credit cards are accepted, most places want tourist business.

caps and underlines don't bother me in the slightest

caps and underlines don't bother me in the slightest>

especially as OP used them - just emphasizing his/her thanks not yelling it.