Hello! It's exciting to hear that you're planning to visit the wonderful cities of Nitra, Trnava, Pieštany, and Trencin in Slovakia. Here are some detailed travel tips for you.

Best Time to Visit:
The best time to visit these cities in Slovakia is from May to September, when the weather is warm and the hours of daylight are long. The scenery is particularly beautiful in the spring and early summer when the flowers are in bloom.

Route and Accessibility:
It's pretty easy to get around Slovakia. The cities are well-connected by trains and buses. The nearest airport is in Bratislava or Vienna from where you can take a train or a bus to your destination cities. For intra-city travel, you can use local buses, trams, or taxis.

Accommodation and Booking:
There are plenty of accommodations available ranging from budget-friendly hotels to luxury properties. It's advisable to book your accommodation ahead of time, especially during the peak tourist season. Websites such as Booking.com and Airbnb can offer diverse options to suit your needs.

Clothing and Essentials:
Packing lightweight clothing for summer and warmer clothing for cooler nights is recommended. Don't forget to carry a good pair of walking shoes as you'll be exploring city centres. Also, a rain jacket or umbrella could be handy because unpredictable showers are quite common in Slovakia.

Health and Safety:
Ensure that you're up-to-date on routine vaccines before your trip. Slovakia is quite safe, but as with any destination, it's always advisable to stay vigilant, particularly in crowded places. Carry a basic first-aid kit with you.

Local Etiquette and Respect:
Slovaks are generally polite and reserved. It's customary to greet with a firm handshake. When visiting religious sites, be respectful and dress modestly. Tipping is common in restaurants and cafes, usually around 10% of the bill.