I used in my life two routers - from Skyroam and from Polish WiFi. They both did very well, so any local companies with possibility of renting MiFi imho will be good, if is similar to Polish company
Hey! As far as I'm concerned Polish WiFi works now in all European countries... I used it once, when it was only polish and what was different from all big companies it has VERY KIND and UNDERSTANDING call center, no problem with using the device (clear instructions). Easy to rent. I recommend it!