We stayed at Caroline's for a few days to enjoy the sights of Vienna. The apartment is in a great location (apart from the roadworks, which have nothing to do with Caroline).There are multiple restaurants within a few mins walk, or if you want McDonalds even quicker. The UBahn is also just 10 mins walk away which gives you quick stress free travel into the city centre and beyond.
For wheelchair users Caroline's apartment is perfect, step free access from the street or garage all the way to inside the apartment. Outside the pavement/sidewalk is relatively flat and road crossing is straightforward, the green man stays lit for a proper amount of time to allow you to cross without rushing. At the moment there is considerable roadworks being carried out, if you're heading to the shopping/restaurant/cinema complex stay on the same side as the apartment until you reach the crossing as there is one crossing with no dropped kerb on the other side, of course that will be resolved when the roadworks are finished.
Getting on and off the UBahn is straightforward, wheelchair access is towards the front and rear of the train, on the modern train there is an automatic ramp for access. HOWEVER if it is an older train there is no ramp and the step up and platform gap could cause difficulty, one time I had to wait for the next train as there was no way I could get on.