we had a wonderful stay in Ludwig's apartment. we were a group of 8 (adults+children) and the apartment was more then adequate for our group. it was very spacious (i mean HUGE), very clean, and the location was unbeatable - right on the main street, less then a minute walk to the uban station. lots of great cafes, pubs, restaurants literally less then a minute from the apartment.
at first i was afraid the apartment would be loud given the central location, but it was very quite and cosy.
i would highly recommend this apartment to anyone traveling to Vienna,
thank you for a lovely time!