Hostel Azur - room is comfortable and clean. Could be a bit noisy at times as the restaurant and bar is just below the hostel.

 

 

Hotel Central - it's just opposite of the Main Train Station in Zagreb. The single room is small but clean and comfortable. Breakfast is included.
 
Split's main bus station.
These friendly ladies offer private rooms at reasonable rates. Chances are you might be approached by one of them when you arrived at the main bus station.

 

Hostel Pletkovic - there are 3 rooms. My room has 4 single double-decker beds. The bath and toilet are in the room itself. Quiet and very clean. Less than 5 minutes walk to Diocletian's Castle.

Hostel Denino - the room is very nice and it's air-conditioned. Maida even served me coffee in the morning. This private accomodation is situated next to the main bus station, and it is less than 15 minutes walk to Old Town Mostar.
 
This is the yard of the private accomodation that I stayed at. It's a family home run by this friendly couple. Very nice but if you plan to walk to Old Town, I would suggest that you get a place that is nearer.