Gone are the days, when a vacation or backpacking trip to Europe was a distant dream. Today, if planned well and in advance, one can make the most of their budget and create everlasting memories, what with formation of the European Union (Schengen Visa <3).
About the phrase 'Budget trip': We stayed with friends / CouchSurfing wherever we could, mostly walked around the cities or took public transport, rarely ate / drank at restaurants (The supermarkets in Europe are aplenty, and cheap too!)
Although this is about a budget trip, our own was not very cost effective, thanks to impromptu plans and impulsive decisions. But it surely was a 'no regrets' one. We mostly ended up booking expensive flight tickets and AirBnB rooms. CouchSurfing everywhere was not viable at such short notice. That said, with the exception of a handful of countries, the EU is not very expensive to pass through.
Mumbai - Prague - Vienna - Budapest - Madrid - Barcelona - Mumbai