In this list there are quite a few more destinations which are easy to reach with a Eurail Pass:
Seville (Spain): 'The jewel in Andalucia's crown'
- Venice (Italy): 'The city of canals'
- Rome (Italy): 'The eternal city'
- Paris (France): 'The city of light'
- Florence (Italy): 'The stunning capital of Tuscany'
- Lisbon (Portugal): 'Picturesque port city'
- Barcelona (Spain): 'Sparkling Catalan jewel'
Furthermore New York and Edinburgh are featured in AOL's list. Sky Travel has almost the same preferences, in their selection of romantic cities. They also name Prague, Barcelona, New York, Florence, Rome, Paris, Venice, but they differ in their choice of London and Budapest, a grand city on the banks of the Danube in Hungary.
Of course there are many more contenders where you can find love in the air. What to think of Bruges (Belgium), Vienna (Austria), Dubrovnik (Croatia)...