We stayed for three nights and we really appreciated the vicinity to the city centre. Miran and his wife Anita are friendly people, who responded fast to all our questions, which was also helpful.
If you're looking for a flat with full comfort than this is probably not you're choice. We were satisfied though given the price/value ratio. It's more like a student flat - no living room, very basic kitchen equipment, three separate beds. But it was fine for our purpose. The only thing we minded was noise (both from neighbours and the street).
PS: Maribor is really beautiful! Check out restaurant By the Three Ponds at the North end of the city park :-)