I had a fantastic stay at Catharin's. Check in/check out and communication was smooth.
The flat is just as it looks in the photos. Great natural light, high ceilings makes the large studio feel even more spacious. Very comfortable/big bed, perfect after long day walking. Kitchen as described, enough room to make meals and a big fridge. The bathroom is small but the shower is a good size and worked perfectly - no hot water issues.
Location is really good. You are 1 minute from lots of supermarkets, restaurants and coffee shops. So you will never be stuck for choice or go hungry. The flat is a 5 minute walk from the top of Mariahilfer Strabe - which is a very popular and fashionable high street. And this high street takes you all the way into the old Vienna town.
All in all I had a perfect stay. I would highly recommend Catharin and her apartment for both short and long stays in Vienna.