Spacious apartment next to U1 and close to the main train station. We stayed there for a week to visit friends and spend some time in Vienna. I don't think it's quite big enough for 4 people bc there is only one bathroom, but for a couple it was really big and I had the luxury of using one bedroom as my home office. It's very easy to get around from there and there are plenty of supermarkets and affordable restaurants in walking distance. Being close to the main station and one of the very few supermarkets of Vienna that are open on Sundays and holidays is a great plus.