Great spacious apartment. Not luxury feel but a more basic, clean and very comfortable apartment - feels like staying at your own place. The location is close to everything, it's right next door to perhaps the most amazing castle in Vienna - the Belvedere, and train stations are close. The main old town is maybe 15-20 minutes walk, and 5-10 with the train.
I would especially recommend the apartment for a family in summer, it's spacious and right across the street, there is a park with a swimming pool for younger kids. (Didn't have time to go to the pool myself, only to park but saw pictures of the pool online. If important double-check that its still there and open :-)
The neighbourhood is nothing special I would say, some restaurants etc in the streets around but you need to walk 10 minutes to get to an area that feels more attractive to hang out in.
The apartment is also on the first floor (which is good because you have an outside patio) but it's also on a big main road. It didn't bother us at all, (easier access from the street) and it was not any issues with sounds etc. Two bedrooms are also facing the inner garden so if noise is an issue for some reason, you can sleep there. It was not for us but worth mentioning.
The house block from the outside looks quite worn down as well, but the same here, once inside the house it's all good so not a problem for us. Also just worth mentioning because when you arrive by Taxi the first thought is - can this really be the place :-) Apparently, the house has an old history since the war which has an impact on the ability to renovate and keep it looking good from the outside.
Anyway, Bea and her friend who helped us were super friendly and helpful and solved any issues we had asap so I would warmly recommend both them and their apartment for a stay.
Enjoy Vienna!