Life /
Tips on tipping in Poland [45]
I've been to restaurants in Krakow with my (Polish) girlfriend. the bill was entirely written in Polish, except a mention "service not included" in English.
That would suggest to me that your friend is rather tight fisted. I have never been anywhere in Krakow where service is included and they have lied on the receipt. As for working in a restaurant, people do expect tips. Wages for waiting staff are around 6pln per hour and they make up the rest in tips.
As such I have always left a tip in restaurants. Taxis are extorsionate so I don't tip them. I tip the hairdresser but just to round it, same with the pizza guy.
I told her "Take five ten".
For this situation, just say clearly how much you want the total to be...that's how most polish people did it with me.