1. Gamla Stan, also known as Stockholm Old Town, is one of the most popular tourist destinations in Stockholm. It is the historical heart of the city and is characterized by its narrow cobblestone streets, colorful buildings, and beautiful architecture. The area is home to many important landmarks, including the Royal Palace, Storkyrkan Cathedral, and the Nobel Museum. Visitors can explore the charming streets, browse the various shops and boutiques, and enjoy a meal or drink at one of the many restaurants and cafes.

2. There are no specific working hours for Gamla Stan as it is a neighborhood rather than a specific attraction. However, most shops and restaurants will be open during normal business hours. For specific attractions within Gamla Stan, such as the Royal Palace or the Nobel Museum, it is advisable to check their individual opening hours.

3. There is no entrance fee for Gamla Stan itself, as it is a public neighborhood. However, some of the attractions within the area may have admission fees. Public transportation is the best way to get to Gamla Stan, with several metro stations and bus stops nearby. Visitors can also explore the area on foot, as it is relatively compact and pedestrian-friendly.