Currently have the standard Swing radio in my 2012 Monte Carlo Fabia. Want to install a new radio with Bluetooth and GPS features, but don't want to go through a lot of hassle, I know I'll probably have to get a GPS receiver though. Would a Columbus fit the fascia of the Swing? Or should I look for a Bolero? Definitely know I want a proper Skoda radio in the car, just want to know what fits!

If you want Bluetooth then your only option is an Amundsen + unit. That's the only OEM unit with Bluetooth built in, and you'll have to make sure the one you buy does have Bluetooth because not all of them do.