Hello welcome to OpenStreetMap!

Are you sure it's there? There was a note about this and a local mapper surveyed this area and they couldn't find it: https://www.openstreetmap.org/note/4228015

The website you linked does not work. 

The phone number is not even Hungarian. And you shouldn't convert an apartment building to a restaurant. 

So there is no proof of this thing existing online or offline. Please reply if you are sure this thing should be mapped, with working website or any other proof.

If you won't reply I will revert this, as this seems fishy.