The city is a mixture of Romance and Communist architecture. There is no real city centre as such; the busiest areas are probably Unirii 2 and Piata Romana. Many free sights like the parliament and Piata G. Enescu. Nice parks to take a stroll.
Insider Tip:The Bus and tram networks are best left to locals. The Metro provides access to all areas that a traveller would need. The locals at times can seem slightly snobbish and this mars the atmosphere when trying to relax. There are much more down to earth places.