Any recommendations on a good / reasonable car service ?
A couple listed here
https://community.ricksteves.com/travel-forum/italy/mxp-to-menaggio-best-car-services
If you do a more specific search you’ll find others
No personal experience but have seen positive comments here about them.
For 1-3 people ~$300
Milan has 3 airports, € 300 euro would be the fare from Malpensa.
Do you have to have car service? The train goes to Varenna and it is a lot cheaper.
I agree with above post. Easy train ride to Varenna if you don’t need a car ride.