Andy helped me out when my previous booking fell through (long story, on boy) and I was able to book his apartment with no fuss at the last minute. We were greeted by his mum who was super nice and helpful (though my German is at best terrible so it was quite a funny experience). She showed us in, gave me the keys and left us to it which was perfect.
Andy's communication and readiness to help is really very good and you couldn't wish for a better host. The location is perfect for the city centre, if you want to stay near/in there. It's the top floor but there is a lift. 2 separate bedrooms and a lounge/kitchen area, and nice clean bathroom. Very modern and amazing. Truly lucky to have found this and wish I'd booked it months ago when planning my trip, instead of the place I chose that fell through.
So yeah, get into it if you can. Cheers!