Taxi from airport to Casco Viejo

Is there a good shuttle or legal taxi from the airport to Casco Viejo that can take a single woman who want simply to see this area during a layover?

We have been using Luis Arce as our driver and tour guide for quite some time. He is Excellent and has a van. When we first arrived in Panama we had 4 large suitcases, 2 carryon bags, 1 very large backpack, 1 normal backpack. After a week in Panama, we then had Luis take us to the Decameron to pickup  the car we bought and we had all that we arrived with plus 4 additional large boxes and everything fit in his van.
Luis lived in New York for many year, speaks good English and knows all of Panama. He also has access to many other vehicles such as a larger van, small bus, large bus. He arranged for a box van when we need to pick up our 4'x4'x6' crate at Delvi and have it taken to Pedasi. We highly recommend Luis. Luis is very busy, be assured he will email or call you back as soon as he can, please give him at least 24 hours to do so.
Luis Arce
+507 6536-1179
luistaxi777 @ yahoo.com

Thanks so much - this exactly what I need - THX