Athens Family Limo (My Athens Tour) was recommended to me by a friend who has used their services before. I booked two airport transfers and a Day Tour of Athens for my family visiting from L.A. in January (two couples in their sixties, couple in their 30's and a 5-year-old). Yiannis' Viano fit all their luggage - they were not travelling light! - and himself was very punctual, helpful and patient with my little niece.
I rode with them on the tour (Acropolis, the Museum, Plaka - Monastiraki, lunch, shopping but sadly had to leave before the visit to the wine-yard which I was told was the highlight). Though a local, I found myself rediscovering the city with Yiannis' up-to-date tips and interesting historical input. Flexible stops and good choice of locations made it a laid-back, fun experience, minding the mixed group we were. Reasonable prices on the plus side too, would surely recommend.