We aren't going until September 15th, but I can't believe the temperatures in Vienna right now, and in the long term forecast - 100 degrees! All of central Europe is stiflingly hot.
We booked the Hotel Suzanne, near the Opera, for four nights. I didn't really think about A/C, and probably should have.
Has anyone stayed there during a heat wave? I see nothing indicating there is A/C, and I'm a tad concerned about sleeping at night!