Of course, I'd be happy to help! Exploring Buenos Aires, Rosario, and Córdoba is going to be a vibrant and distinctive experience. Here are some useful travel tips:

Best Time to Visit:
The best time to visit Buenos Aires and Rosario is from March to May and from September to November, which are the Spring and Fall seasons. Córdoba is pleasant to visit during April and May.
Remember, seasons in Argentina are reversed if you're visiting from the Northern Hemisphere.

Route and Accessibility:
You can start your journey in Buenos Aires, then move to Rosario which is just 4 hours away by bus or car. After exploring Rosario, you can head to Córdoba which is a 4-hour drive from Rosario.

Altitude and Acclimatization:
As these cities are at sea level or low elevation, you don't need to worry about altitude sickness! However, staying hydrated and rested is still very important.

Accommodation and Booking:
Always book your accommodation ahead of time. Each city offers a range of accommodations, from luxury hotels to hostels and bed & breakfasts.

Clothing and Essentials:
Pack both light- and medium-weight clothing to accommodate Argentina’s varied climates. Don't forget a sturdy pair of walking shoes exploring city attractions. In case you'll visit the countryside or any outdoor trails, pack insect repellent too!

Health and Safety:
Common sense should always be applied in terms of personal safety. Keep your belongings close, and be alert in crowded places as pick-pocketing can occur.

Local Etiquette and Respect:
Argentinians usually greet each other with a single kiss on the right cheek. Also, being slightly late is common (15-30 minutes for social events). In case you're also visiting religious sites, wear appropriate clothing. Familiarize yourself with Argentinian customs and traditions for a more enriching travel experience.