Venkat & Ernesto - US Visa Services in Mexico

Hi everyone!
I plan on getting my H1B visa stamping done in Mexico. Having never travelled to Mexico, I wanted to know to what is process to pay the visa fee and book an appointment at a US consulate in Mexico. While researching this info, I came across “Venkat & Ernesto - US Visa Services in Mexico”. I wanted to check with the community if anyone has used their services before and if yes,

  1. Are they trustworthy and reliable?
  2. What was your experience like during the whole process(paying the consulate fee and booking the appointment)?
  3. Did you book only the appointment through them or everything (hotel, travel, etc,)?

Sincere thanks to anyone who takes the time to respond to my question.