Ohh I don't know about the taxis. If you do a search on google, you can find some companies which offer this kind of service.
But if you are looking for a cheaper private one, I hope Anne, Stefan or anyone else might help you. Just w8 until other people reply.
There's a beautiful Spanish girl in my university batch:
"Grils españoles son realmente hermosos"
Good Luck and I hope you enjoy your time