Roman's place is the perfect base for a stay in Vienna. There were 3 of us staying and there was more than enough room - the sofa bed is particularly comfortable!! The place was warm, inviting and friendly - gorgeous decor and very cosy.
It's well located for many restaurants, cool bars and only short walks to most of the attractions and sites to visit - there is also a supermarket nearby (very handy). We rarely got public transport because of this.
Roman was very helpful and understanding, allowing us to drop our bags before check-in and leave our things after check-out due to our flight times. He was also speedy at replying, and his assistant - Maria - was very helpful when we arrived, letting us know all the essentials!
Can't recommend this place enough.