I had informed the hotel in advance that I have celiac disease its not a lifestyle option but a necessity to have a GF diet.
The Celiac options were poor (so only ate breakfast), GF roll was soggy no other option provided (staff didn't seem to understand how to even prepare the rolls adequately) Luckily I brought my own toaster bags & tried to rescue the soggy offerings.
No GF biscuit or pastry, for a 4* of this calibre I would have expected a little more effort.
I have stayed in many hotels before some provide a small separate area, toaster (bring your own bread etc.) avoid cross contamination gives the celiac confidence.
Buffet was ok, day 1 small fruit salad available, after that only canned peaches, (fruit available if you wanted to prepare your own fruit salad), not ideal.
Not easy to have an afternoon coffee, snack or drink on the terrace which would be welcome for weary travellers.
Toiletry selection poor for a 4* only bodywash and shampoo combined in the shower, for us ladies I would expect shampoo and conditioner at prices paid. Toiletries not replenished when used, perhaps catering more for the business traveller?
Towels are a bit tired looking
Overall we had a nice stay loved the city of Vienna, hotel was purposeful