I've never met a more enthusiastic host than Miro - he was waiting for us outside the apartment, and even though we said it wasn't necessary he insisted on helping us with the luggage (he is very strong so I guess he felt it was easier for him than us haha!) all the way upstairs. He's clearly very passionate about Vienna and had lots of helpful tips and info to share, and it was great learning so much from him.
The apartment was clean and with the two foldout beds in the living room, six of us managed to sleep without any issues. The only two things about the apartment that may be less than ideal for some people - firstly, the one toilet is very, very small. We kept banging various body parts around in the shower cubicle hehe. So I think someone who is...generously-sized, or claustrophobic, may have an issue with this?
Secondly, the location is fine if you have more time in Vienna or if you are quite fit and don't mind walking. For us, I was travelling with my two elderly parents, so the walk out towards central Vienna got a bit much for them after the first day. There's public transport option, but it doesn't save on that much walking and time so we opted to walk most of the time.
I want to emphasise that Miro is really a fantastic host - he was happy to help us with booking a taxi for departure, and when we had to get back into the apartment because one of us had left something behind, his wife was just as kind and gracious. So if you want a great host experience, you can't do better than him! ;)