I would definitely recommend this place for a solo traveler! Very safe area, yet very close to all public transportation and walkable to main “must see spots”, ( there is also near luggage storage spot to leave luggage!), but also you feel market feeling and Vienna. Apartment was great, warmth and welcoming gift which was left was so, so lovely! Only thing for not deep sleepers - as it is center located ( which is great, but it can come with noise), you can hear cars at night, wasn’t problem for me, but could be for some..💤
Overall, I totally recommend to all this place to enjoy Vienna! 😊