The "Happy Rizzi House" is located in the historic Magniviertel in Braunschweig. The area around the Magnikirche is considered the "cradle of Braunschweig". Count Bruno built his first farm there in 861. Thus the name Brunonis Vicus originated from the term Wiek (port and trading place) for this place, from which the first documentary mention Braunschweig with Brunesguik came in 1031 and developed further to Brunswiek. The former centre of the Brunonian Herrendorf was the small one-nave church building, on whose foundation walls the present Magnikirche (waypoint) tront since 1252.

In 1944, on the night of the bombing, the built-up outskirts of the Magniviertel and the ducal stables in the western wing of the castle fell victim to the attacks. Between the stables, which in addition to the western wing were housed in a large complex in the inner courtyard, was the Ackerhof portal, which led from the Mar stables to the square of the same name and thus to the Magniviertel.

The Magniviertel belongs to the five traditional islands of the city of Braunschweig, which were built after the war to preserve preserved and connected half-timbered monuments.

After the controversial demolition of the castle in 1960, the town planning created a four-lane street north of the Magniviertel and partially buried the ruins of the Marstall stables underneath.

The five-storey "Happy Rizzi House" has been standing since 2001 - after two years of construction - on the site where the flat building of the Marstables was located and offers a cheerful contrast to the old half-timbered buildings and the post-war buildings.