Update: This place will do everything to rip you off.
If you’re in Mala Strana and would like to have a good beer at a decent price, Malostranska Pivnice is a good place to try. Located around the corner from the metro station Malostranska, this restaurant is quaintly decorated and has a large garden for outdoor drinking, as well as plenty of seats inside.
They serve typical Czech food which is a bit pricey. Their goulash with bread and bacon dumplings, which is one of their cheaper items, is quite tasty. However, their beer is a good price. This restaurant is frequented mostly by tourists, and can become quite busy, but still a good place to try especially if you have a large party and a craving for goulash.