The apartman is in the heart of the city, around sights, middle of night life and despite of this, quiet.
The public transport is excellent, all metro lines 2min walk.
It's exactly next to the famous Gozsdu Udvar, which has many restaurants, bars, pub, 1min walk to Synagoge, 10min walk to Basilica, Parliament and Opera, 1corner to Kazinczy Street, the center of ruin pubs, like Szimpla Kert and street food, all sight is in walking distance.
If you have any question, I'm happy to answer it! :)