Hotel Zeder is close to the airport, clean and comfortable. We booked a four-bed room for our family of four, but were pleasantly surprised when we got two interconnected rooms with a bathroom each, especially our teenage kids! An excellent buffet breakfast is included in price. Beds are comfortable, morning gown and slippers provided as well.
Hotel's airport shuttle is convenient, especially if your flight is at night time or you don't want to bother with taxis. It costs 10 euro each way, it might be just slightly cheaper option when coming from the airport. If going to the airport, taxis cost less during the day, especially if you prebook (we payed just over 5 euro). After 10pm most taxis charge higher prices.
We would definitely stay at hotel Zeder again if flying via Belgrade.