We used True Blue for a full day Istanbul excursion. One day before our excursion, they rang us in the hotel to confirm the time they would pick us up from the hotel. Next day, they were exactly on time and we found we had a really wonderful guide, Ozlim, to show us Istanbul. Ozlim is a wonderful person who is really knowledgable on Istanbul and she showed us around in a really friendly way. We had a really nice day and we learnt so much about Istanbul - this is a great way to get introduced to Istanbul.
On the day before our departure, our 5 star hotel was very unhelpful in wanting to charge us over 120 EUR just for an airport drop-off. We called True Blue and in 5 minutes they had organized the car to the airport at a reasonable rate and next day the car was there exactly on time for a relaxing trip to the airport.
We found True Blue is efficient and takes care and pride in their arrangements.