My son and I hired Marcela at the last minute for a tour of San Juán de Ulúa  and the historic area of Veracruz.  She was great!  She was knowledgable, friendly, and had good English skills.  She picked us up at our hotel in the historic area of Veracruz.  Her driver (who we later found out was her husband, although I think she often uses her father) had a nice new car that was spotlessly clean.  We enjoyed walking and talking for the morning - she was a good source of information and easy to be with.  Setting up the tour was simple and she was very responsive via email.  I would highly recommend her.