The flat is nice and has good communication and the public transport like busses, subway and train railway are close.
Vera is a great host. Wien was really hot during my stay and she immediately gave me a fan. Fast answers. I recommend Veras flat 100%. But if you have problem with stairs I can say that, the only inconvenient that the flat has it's that it doesn't have elevator. But anyway if you like to do exercise, you are on the right way.