We took two walking bicycles.
The owner speaks excellent English and a little Russian, is very friendly,
explained and showed how to adjust the seat height, how to change gears and what problems there may be if you do not follow the recommendations (great for beginners). He also told and showed what routes there are and where it is better to go.
The bikes were in good condition.
Nice prices and payment format. (you leave a document (passport / license) or 200 euros as a deposit, payment upon return of the bike)
I also rounded up the rental time downwards.
I was satisfied with the choice of bike rental.
I also note that when I returned, I was treated to a Serbian delicacy, I felt that I was being trained - I liked it :)
Only positive impressions remained. I recommend it to everyone.