I don't know what it's like in Warsaw,
Very good,that I have seen anywhere in my life and very cheap.I dont use much now so just buy time ticket for 3.50 pln for 20 minute travel or if I have to travel a lot I top up my "Warszawska karta miejska" for 98 Pln for unlimited travel from the day of first travel.
Lot of cab companies too so I check all there apps and get the cheapest one,lately "free now" is doing very well.This time I paid only 15 pln from centrum to the airport.Uber is the most expensive one.