Hello! It sounds like an exciting trip you are planning to Slovakia. Here are some travel tips to help you:

Best Time to Visit:
The best time to visit Slovakia, including cities like Banská Štiavnica, Hontianske Moravce, Zvolen, and Levice, is late Spring (May-June) and early Autumn (September-October), when the weather is pleasant and the tourist crowds are smaller. The Summer months (July-August) are also good for outdoor activities but may be more crowded.

Route and Accessibility:
Bratislava is the main international gateway to Slovakia. From there, you can take trains or buses to reach the other cities. Banská Štiavnica, Hontianske Moravce, Zvolen, and Levice are all well connected by public transport. Hiring a car could also be an option if you prefer more flexibility.

Accommodation and Booking:
There are a variety of accommodations available in these cities ranging from luxury hotels to budget guest houses. It's recommended to book your accommodation in advance, particularly during the peak tourist season. Online platforms like Booking.com, Airbnb, and the local tourism websites can be used for reservations.

Clothing and Essentials:
Packing should depend on the season of your visit. Pack warm clothing and good footwear if you're visiting in winter. For summer, light clothing with a few layers for cooler evenings should suffice. Essential items can include a good quality sunscreen, a reusable water bottle, and a map or guidebook.

Health and Safety:
Slovakia is generally safe for travel. However, it's always wise to have travel insurance covering health, accident, loss, and cancellation. It's also advisable to keep emergency numbers and the address and contact details of your country's embassy in Slovakia.

Local Etiquette and Respect:
Slovaks are typically polite and reserved. It's common to greet with a handshake and direct eye contact. In public places, try to keep noise to a minimum. It's respectful to learn a few basic phrases in Slovak, as this is always appreciated by locals.