Martin was a great host! He was very accessible both before and during our stay. He was very accommodating of our delayed flight and very patiently answered all our questions. The flat itself was perfect - incredible value for money and located near public transport (walking to distance to both Schweglerstraße and Westbahnof on the U3 line). That means you're probably less than 10 minutes away from the First District which is the old town of Vienna. The only think to point out was that the wifi was very slow but that's a really small thing in light of the massive positives. I would definitely recommend staying at Martin's flat.