Nikola's place is perfectly located right by the center of the city. He is a very kind, helpful and communicative host. While his place is perfectly clean and neat inside, just be aware that the outside of the building is strikingly ugly and run down. Don't worry, the inside of the apartment does not reflect what the building looks like on the outside, but of course there are no pictures of the building itself for good reason.
I personally would not recommend staying here in the summer because the apartment gets very hot. We made the mistake of not checking if the place includes air conditioning (which is our fault of course, not Nikola's) and he provided a fan that we propped up on a chair in front of the bed so that we could sleep at night.
When we arrived he informed us that the wifi isn't working, which was not a big deal but might have been good to know before we booked the place.
Overall it's a clean and neat place in a great location with a good host.