A beautiful, comfortable space with lots of amenities and Sara is a wonderful and responsive host. The apartment worked out pretty well for the month we were there, though I will say it was a bit less convenient by public transport to Innere Stadt than I was hoping. Budget at least 20-30 minutes to get to Stephansplatz (for example) and be aware that the Sunday schedule for bus service at least is totally different than the rest of the week, so plan carefully or just walk through the Augarten to get to the UBahn. Being able to take my toddler to the Augarten every day just by crossing the street was awesome though - multiple playgrounds, lots of benches, a free kids pool, and tons of chestnuts to collect definitely made my life easier.
The only real negative was that there is a bit of a musty smell to the apartment that stayed with our things after we'd left (until we washed them), so if you're sensitive to such things then this might not be the place for you. But honestly it didn't bother us much until after we'd left. Overall, we enjoyed our stay.