Great experience at this hotel. It's location is perfect, right next to the city centre (and in the middle of two of Nis' attractions - the Fortress & the Skull Tower).
The rooms are large, bright, clean and spacious.
Even the balcony was big.
The staff were extremely helpful and accommodating - from showing me on Google maps which ATM/bankomat to use without fees, to allowing me to check out later (which enabled me to work for a few hours longer before moving to another country).
Access to the building is simple with an electronic tag, and there is a bar/restaurant directly downstairs (as well as food options and supermarkets within 3mins walk).