Meh, if it needs a recharge its definitly leaking somewhere. There could be a lot more problems then “just a recharge”. Not familiar with VW A/C systems but the expansion valve could be shot or the compressor not working properly. But basically if you just want a re-charge most small shops will do it for <$100. I’d actually figure out the problem first though, especially if its a leak. Because you can recharge it today if its leaking but depending on the leak it could not work again tomorrow.