We rented Sarmad's apartment for a few days in July 2018 and really enjoyed our stay.
The place is located in a nice, peaceful area with beautiful buildings around and stores and restaurants within walking distance. It is also close to the Rathaus and its metro station, which comes handy when travelling elsewhere in the city.
The flat itself is extremely spacious and well equipped. There is only one toilet and one bathroom, which might be an issue for some but we managed ok.
Sarmad was incredibly fast in replying to our messages and everything went very smoothly with our check-in and check-out.
I can highly recommend Sarmad's place to other visitors in Vienna.
PS. If you are allergic to gluten or have celiac disease, make sure you go to Pizzeria Scarabocchio closeby, both their gluten-free and normal pizzas are amazing.