Gustavo represents everything you want in a tour guide.  He is knowledgeable, courteous, friendly and has a great sense of humour.  We had a private 5 hour tour where we were shown historical and cultural and culinary highlights of Bogota with detailed commentary by Gustavo.  He is also most helpful and goes the extra mile when needed.  My husband was using a wheelchair and Gustavo graciously navigated him through narrow cobblestone streets.  We would highly recommend using Gustavo on your visit to Bogota......he will make your visit most memorable.