A small amount is a good idea, but your best exchange rate is at an ATM near wherever you’re staying.
Usually not. Most places we stay provide laundry services for cycling clothing only. Be sure to check the details on the hotel site.
Sneakers are best because the pedals are flat.
For all of our trips we ask for approximately 10% or €100 for each guest which is divided by the Hotel Manager to thank all the staff that have taken care of us. We also tip the guides separately on overnight excursions away from the hotels. Also approximately 10% of the cost of the excursion.