Described is a method of producing a repertoire of random peptides on the surface of AAV particles wherein said random peptides are expressed as a fusion with an AAV capsid protein of an AAV particle which displays at its surface said random polypeptides. Also described is a peptide library obtainable by said method as well as a method of selecting a gene therapy vector specific for a desired cell type comprising the steps of (a) infecting the desired cell type with a peptide library of the invention and (b) harvesting AAV library particles from the supernatant and/or cell lysates. Finally, AAV vectors obtained by said method are described which are useful for gene therapy, e.g., AAV vectors targeting primary human coronary artery endothelial cells which are suitable for the treatment of diseases associated with a dysfunction of said cells.