Why go
The main safety decisions are small and practical: protect valuables when people press close together, keep a clear hold on luggage, and avoid letting a distraction separate you from a bag or phone. Planning for heat, long walks and museum fatigue also makes a densely scheduled day more manageable.
The full story
Treat crowded places as the moments that need the most attention. Platforms and concourses around Santa Maria Novella, packed buses and busy sight areas make it easier for a distracted traveler to lose track of a phone, wallet or bag. Carry valuables in a closed bag kept in front of you, and do not leave luggage unattended while buying a ticket or checking a map. If someone creates a distraction, pause before opening a bag or handling cash. Florence also asks a lot of feet and concentration. Stone streets, queues and closely spaced museums can turn an ambitious plan into a tiring one. Build in water, food and a seated break, particularly in warm weather, and reduce the number of major interiors if you are already flagging. For an emergency or a current medical need, use official local services or ask your accommodation for the appropriate contact rather than relying on an old printed number.