Zuzana's apt is well-situated, right on Greenmarket Square and a block from Long Street. One doesn't hear much noise from the street, since the apt windows face the inner courtyard. But it's worth noting that there is construction/renovations going on in the building opposite and we heard a fair amount of noise during the day we checked in (Friday) but there was not much noise over the weekend.
It was very convenient having secured parking onsite. Zuzana was great with communication and booking.