The owner are a friendly young couple that owns a bike sharing system in Warsaw. Besides they also rent bikes to tourist on a daily basis if you wish not to go through the lengthy register process of the city bike system. The price is quite cheap starting from about 2 euro per day and but they also have other types of bike which costs a bit more (3-5 euro/day). The tour is organized by the couple from time to time and we found them on Airbnb experience. In the end we didn't take a tour but just rent two bikes from them. The process is quick and easy. Pick up and return the bike in the center by appointment. No hassel!