I didn't get a chance to meet Boris in person, but he was always extremely accessible to answer any questions I had. I stayed five nights at his apartment in Vienna, and it was a great home base for exploring the city and further afield. It's a 2-3 minute walk from the Margaretengurtel stop off the U4 line, making it very convenient to get anywhere you need to. The bedroom was roomy, and it was nice having a kitchen with refrigerator available. Highly recommended!