Direct answer
Kathmandu is Nepal’s bustling cultural and historic heart — prepare for high energy, rich heritage, variable air quality, and basic but improving tourist infrastructure. Plan visas, timing, safety and transport in advance to get the most from your visit.
Enjoyment checklist
If you want, I can suggest a 1–3 day Kathmandu itinerary or help book a SIM, airport pickup, or recommend trusted local guides and restaurants.