Located 1 km from the Kalemegdan Fortress and park, Hostel 21 offers rooms in the centre of Belgrade. Free WiFi access is available, as is on-site bike rental. Rooms here come with linen and towels. Some feature a private bathroom, while some have access to a shared bathroom with showers. 21 Hostel provides guests with a terrace, shared kitchen, lounge and games room. A bar can be found on site, as can a 24-hour front desk. Luggage storage is also available. Several café bars and restaurants can be found within a 500-metre radius. The Belgrade National Theatre is 300 metres away from the property. Belgrade Train Station is 1 km away from the property. Nikola Tesla Airport is located at a distance of 17 km.