What to do with (small) children in Lisbon on a 5-7 hour transit layover? @Gilles good point with the taxi. I wouldn't recommend the buses though. If you use the airport shuttle it has a special rate (and its not faster than the subway). The only advantage would be having a direct connection if going downtown.
What is the cheapest way of traveling from Berlin to Krakow? Thank you for the answer. I will look at hitchhike website but that's probably not an option. Even having time it's convenient to know in advance the time spent traveling. Hitch hiking can be really variable.