Gin's flat is what you expect for the price: small, cosy and functional. It was very clean and had everything we needed for a comfortable stay if you are a couple.
Gin was helpful on WhatsApp, and was very accommodating, letting us check out a bit later. We never met him, but there was no real need for it.
It is reasonably close to the center and we even walked there almost every time (it is about 20 to 25 minutes by foot to the Belvedere, Nachsmarkt or the Museum Quarter). The area is just apartment buildings with a few local services (supermarkets, bars, kebab places...), and a very nice beer shop almost next door. Easy access to public transport in all of its variations (tram, and train are within a couple of minutes walk). All in all, I can definitely recommend the place