I have been to two outlets of Costa Coffee in Kolkata. One is in front of RDB Boulevard in Sector V and another in Mani Square mall. I find the ambiance at sector V much better than Mani square mall. The outlet at Sec V is bigger and looks much cozier which is important for a coffee shop.
The best part of Costa Coffee would be their coffee. Their coffee is made from Arabica coffee which has better taste and smell than the robusta coffee. The quality comes at a price so expect the coffee prices to be higher at Costa Coffee. The coffee would please any coffee lover. The best way to judge a good coffee is to drink black coffee without milk and sugar.
Try black coffee at CCD and Costa Coffee and you would feel the difference. The hot coffee comes in three sizes. Order the smallest size else you would get too full. Sandwiches are not made from white bread but from parmesano bread or brown bread. Taste has been modified to suit Indian tastes and they are fantastic. Try anything and you would not be disappointed. Their cakes and pastries are bigger in size and in cost I believe too.
Service at Mani Square needs improvement. The way the bill is given might put off some customers. It definitely puts me off. Go there for good coffee. The coffee would justify the price.