Poznan's restaurant scene is expanding all the time and you won't have any problem finding a decent spot. There's also plenty of room to chop 'n' change, with Italian, International and Oriental options now in play. Service may not always be lightning quick, but gone are the days when smiles were a rare phenomenon.
Not kosher, but excellent Jewish food when we ate lunch there about 10 years ago.
Great value and healthy food in large portions.
I lived in Poznan for 4 months, and went to Piccolo almost every day! It is so cheap for a huge amount of food, and it's delicious. Simply and quick.