Sorry but Vienna is NOT in the Alps. Austria is not a microstate and can't be reduced to a formula. Vienna is a flatland city with some moderate uplands (Kahlenberg).
As for being "in the foothills of the Alps", it would be valid (even more valid) for Monaco too.
For the clue "Has a 4-letter name", the answer "Riga" is followed four rows down by "Bern." That should be corrected.
As for being "in the foothills of the Alps", it would be valid (even more valid) for Monaco too.