Just to clarify when calling taxis, there is a 4€ dispatch fee. The 7€ fee is to arrange for future pickup. There is no dispatch fee if you hail a taxi or go to a taxi stand. Airport departures are from taxi stands - no dispatch fees.
Taxis are very reliable and are always on time, if not 5 minutes early. If you arrange for a 7h00 pickup, be ready at 06h55.
The only other taxi fee is if you travel with more than 4 passengers. There is a 5.50€ up charge for the 5th, 6th, and 7th passengers. There are no other taxis fees. The préfecture, which sets all taxi prices, has disallowed approach fees or luggage charges.
All this information is displayed in every taxi, written on a sticker found on the passenger left rear window. The information is in French and English.