I stayed two nights at Oleg's and I'm still amazed by his hospitality. He even gave me really good advice on what to do and where to eat.
The house is really clean, and it has everything you can ask for. You can use the kitchen, WiFi, dishes, coffee machine, and even do your laundry.
Also, the location is simply unbeatable. I was steps away from the old town square.
I would totally recommend anyone to stay here when visiting Prague.