What a great place to stay in Vienna! We loved Sandra’s apartment, it’s huge, it has a nice garden with a BBQ, it has a sauna, which we used every day. The bed was comfortable (but be careful, don’t bang your leg on the wodden sides of the bed). The bedding was very comfy. The location is excellent, plenty of good restaurants and a bakery on the same street. The place is a little dark, but there are plenty of lights you can use to make it lighter.
Note the apartment does not have a washing machine, but there is a Green&Clean laundrette just down the road (10-15min walk). Definitely recommended.