Here is a rough guide as of Summer 2014

BREAKFAST

A full breakfast with a drink will be about 7 euros, continental 5.50, scrambled egg and toast 6.50, fresh squeezed OJ 3.50.

MAIN MEALS

Souvlaki/Chops/Grills 9 to 11 euros
Chicken (variety of sauces) 8 to 10 euros
Steak/Stroganoff 18/19 euros
Kalamari/Sole 9/10 euros
Swordfish 10/12 euros
Shrimp/Dorada/Bream 17 to 19 euros

Rooster in red wine at Mavrikos 14.90 euros. Lamb Shank Kleftico at Philosophia 14.50 euros.

DESSERTS

Baklava/Apple Pie/Pastries/Cheese/Ice Cream 3 to 5 euros
Special Desserts 6 euros

DRINKS

Hot Drinks 2.50/3 euros
Frappe & Ice Cream 4 euros
Wine 75cl 13 to 20 euros
Long Drinks 6 euros
Bottle Beers 3/4 euros
Draft Beer half litre 4 euros
Soft Drinks 2/3 euros.

If you are charged much more than this for drinks in a bar I would question it.