I'd like to visit some walkable cities in Europe over the next six weekends. I don't know when I'll next be in Europe, so this is my chance. My current homebase of Dublin fits the bill: walkable, good public transportation, lovely climate (in my opinion), LOTS to see! I'm told that Amsterdam and Prague are absolute musts. [more inside]
I will be working Ireland for a few months, from June to August. I plan on spending my weekends and other free periods visiting the rest of Europe. Because I'll be working, my availability isn't set in stone. So now, this penny-pincher wants to know if it is possible to get cheap round-trip airfares (below 100 euros) after I arrive and decide on places as my time frees up ... or if I have to buy the tickets and have a set itinerary NOW.