The flat itself is not great, but for this price you cannot expect anything more in such wonderful surroundings.
Oleg is a very communicative person so do not be afraid to ask him anything, he will certainly do his best! For example he allowed us to check in much more earlier than we were supposed to. Wi-fi worked perfectly too.
The flat is kinda hard to find without navigation due to the fact that the street is really short and even locals sometimes do not know about it, even though it is placed in the heart of the old city. I recommend making your own map at home to avoid problems with looking for the flat.