La casa di Golan Vivaldi is not much to look at. He lives in "Piccola Mahakam" , right next door to Kalkstein. He does, however, provide a place for Zoltan to hang out most days in Capitolo II, and a safe haven for Yaevinn, whenever he's in town. He doesn't have much since the bankruptcy and takeover at la banca, but he still has a few valuables, like his libri.
Vivaldi is also quite hospitable, allowing Geralt to stop and meditate there anytime he is in residence.