A few steps from the city center, the residential area begins so you will get to visit one of the local neighborhood bars. Things there are totally different. You will find relaxed, casually dressed locals interested in an open conversation with you. Also, lets not forget about the prices which are about half the prices from the Old City, making it a great reason for a good start.
The next step will be to get in touch with the most interesting bars of Bucharest. Depending on your preferences, you will have a large variety of concept pubs, starting with minimalistic, funk and traditional to the more posh and glossy ones.
In the end but only at the halfway point during the tour, you will switch to a club. Imagine that Bucharest is competing with Ibiza in this field, the atmosphere is more than incredible.