Rented for a weekend a studio in city center, called "Srping Time". Absolutely everything is within walking distance, at literally few minutes: sights-seeings, restaurants, bars & clubs, museum, grocery stores, etc. Most important, even if you are in the Old Town, it is so, so quiet! And super clean. The studio looked exactly like in the pictures. The kitchen was small, but had all what I needed, including a washing machine. Please be aware that you need have to buy detergent, which is not a big deal. WiFi worked perfectly, the large working desk was very helpful as well.
Don't hesitate to rent from Alia Accommodation. Prices are more than reasonable.
Bucharest Serviced Apartments