I used a few Viator airport transfer services, this one was excellent the driver was very helpful we got stuck in traffic and were late getting back to the hotel to depart but he was there waiting patiently, we paid a small amount extra for that but it was well worth it, still made the flight in good time
The driver was unfamiliar with the e-voucher which left us a bit uneasy as we embarkedn the trip.
At JFK he announced that 10 needed paying to bring the total up to 62. When we showed him your receipt for 62 he insisted we had only paid 52. We ended up giving him the 10 as our flight by jow had started to board having sat for 15 minutes on the kerbside arguing.
driver was about 10 min. early and said it was no big deal, we came down to lobby in about 5 min. He was very friendy but professional. Used Viator in London last year and very pleased as well.