Airport to hotel transfer

Go with Welcome Pickups. They are reliable and can provide a vehicle appropriate for your needs.

If you need a minivan, book it in advance. You will have difficulty finding unbooked minivans at the airport taxi stand. Or take 2 taxis.

Welcome pickup works well in Athens. I use it when I need to pre-book a taxi when public transport is not available.
This is a few euros more than the flat rate. The flat rate to the city center is €40 from 5 a.m. to midnight.

If you take a taxi from the airport stand, let the driver know beforehand that you know the price of €40.
If he wants to charge you more, take another taxi.

Whatever service or application you use to call a taxi (Uber, Welcome Pickups, Freenow..) it will always be an official taxi. Only drivers with a taxi license are allowed in Greece.

We booked our transfer through the hotel. Probably a few more Euro than WP, but an easy request via email with the hotel.

Another yes vote for Welcome in Athens. We used twice in June with two different drivers and both were excellent—one was the nicest car we’ve ever had in 20 years of transferring in Athens.

Another vote for Welcome Pickups. I used them from and to the Athens Airport.

The first driver had a bottle of cold water for me and offered me the use of the car's wifi.

Both driver's spoke fluent English.

Another vote for Welcome Pickups. We were staying at the Hera Hotel and emailed them for a recommendation and they recommended Welcome Pickups. We used them twice now on our two trips to Athens.

Currently in Greece in Thessaloniki, I just took a Welcome Pickups taxi this morning at 4am, nice driver, taxi on time. A few Euros more than a non-pre-booked taxi.

We found cabs of all sizes plentiful at the airports and very easy to use to get to hotel. Simply printed off the hotel confirmation and handed to driver. Cabs were simple and safe in Athens, Mykonos and Santorini.