In short
The Palace of the Parliament, commissioned by Ceaușescu, is the heaviest administrative building in the world and the second largest after the Pentagon. It can be visited, and you need ID to get in.
Romania has some of the best internet speeds in Europe, inherited from a late but complete fibre rollout. That is a concrete argument, not a statistic.
What it really costs
Bucharest is markedly cheaper than western capitals and slightly cheaper than Sofia on housing, slightly dearer on going out.
Romania has not adopted the euro: you pay in lei, and the conversion offered by terminals and cash machines is always unfavourable. Choose "pay in RON" every time.
What nobody tells you
The historic centre, Lipscani, has become a bar district concentrated in a few streets. The rest of the city is vast, scattered, and is not discovered on foot.
Ceaușescu's boulevards flattened whole quarters, and older architecture survives in pockets: the pre-war villas of the Armenian quarter or Cotroceni are worth the detour and appear on no circuit.
Stray dogs, long a real problem, have greatly diminished. Some remain on the outskirts, none in the centre.