The Chinese food scene in Budapest is more than meets the eye. While the inner city is teeming with uninviting but cheap buffet-style Chinese restaurants, there do exist excellent Chinese places too. Many are in Monori Center, also known as Budapest’s Chinatown. Be it Sichuan cuisine, dim sum, hot potting, Dongbei-style barbecue, or some other recent Chinese food trend you're after, you will find it all there.
Finally, a note of caution: Chinese dinners generally start on the earlier side (around 6 p.m.), so plan accordingly if you prefer a lively ambiance over empty tables around you.