I honestly can't remember if it was a turbo prop or RJ, sorry. The flight from VIE to KRK was on OS, not LOT. It must have been a typical, uneventful, short flight, otherwise I would remember something bad.

I'm pretty sure that the flight from KRK to WAW is a turbo prop.

Service on LOT (IMO) is no different than any other European airline for these short flights. On time, and a quick sandwich.

I will say that at check in, the LOT personal are very polite, helpful, and treat you like a human, and not just like the luggage that you hand them.