Pick European cities by how many days you have. Here's the honest mapping.
3-day trips (long weekend)
- Best: Lisbon, Porto, Krakow, Budapest, Copenhagen, Edinburgh.
- Workable: Florence, Vienna, Prague.
- Skip: Rome, London, Berlin, Paris, Istanbul. They need more.
5-day trips
- Best: Madrid, Barcelona, Vienna, Prague, Florence + Tuscany.
- Workable: Rome (just barely), London (just barely).
- Try: Multi-city only if cities are 1-2h apart by train.
7-day trips
- Best: Italy classic (Rome+Florence+Venice), Iberia loop (Madrid+Andalusia), Greek mainland + 1 island.
- Workable: France Paris+region, Germany Berlin+Munich.
10-day trips
- Best: Eastern European loop (Prague+Vienna+Budapest+Krakow), Croatia+Slovenia, Sicily focus, Mediterranean coast.
- Workable: Italy classic + Tuscany day-trips, Spain Madrid+Andalusia+Barcelona.
14+ days
- Best: Country-specific deep dives — Italy 14-day, Spain 14-day, France 14-day.
- Or: Two-country combinations — Italy+Greece, Spain+Portugal, France+Italy.
21+ days
- Best: Multi-region itineraries with depth.
- Slow travel: 7+ nights per city.
Strategy
The biggest first-time mistake is over-cramming. 7-day European trips usually try 4 cities; 5 cities is often the right answer. Pick cities by trip duration, not by what's "famous."
For specific itineraries see first-time itineraries.