Hi Claudia
Stayed at the Atrium in 2005, it's a good hotel, but nothing fancy. Some rooms can be a bit small, we had 2 stays there...1st room was quite small. 2nd time room was bigger.
Breakfast is ok, bit more than continental.
It calls itself an upmarket hotel but we have just come back from Krakow again and stayed at the Andels and there is no comparison....the Andels IS upmarket and I would stay there again like a shot!
The Andels might even be cheaper than the Atrium, I got a very good rate from alpharooms.com
Food wise and prices - vary depending on what you like to eat..on average, a 3 course meal with drinks will cost you around £25 to 30 but can be a lot lower or higher. Can recommend the Cherubino and Taco Mexicana restaurants.
Cheers
Tinka14