Final answer:
Mr. Santiago had a positive impression due to the warm greeting by the receptionist, the tidy office space, the efficient and warm staff, and Dr. Munoz's empathy and ability to address his concerns.
Step-by-step explanation:
Based on the description provided, a positive impression on Mr. Santiago was made by several aspects of his initial visit to the medical office of Dr. Laura Munoz. The factors contributing to his positive experience include being greeted warmly by the receptionist and being called by name, the clean and tidy office environment, the efficient and organized staff, and the warmth they displayed. Furthermore, Mr. Santiago was also impressed with Dr. Munoz's empathy and her excellent listening skills, as she was able to listen to and respond to his concerns effectively, which is crucial for managing a chronic condition such as diabetes.