A nice hostel near the bus station. A copule of minutos away from the Riva and with a couple of supermarkets on the corner. Also really nice staff willing to help with information for different day tours.
Majdas hostel is like a second home for backpackers! The living room they have is an amazing social area to meet the rest of the travellers. The tour they offer is the best, Bata is an incredible tour guide (a bit cracy :) ), so if you can spend more than one day is worth to take it. In my last day, they told us about an alternative bosnian music concert (Laka) and half of the hostel went. It was such an amazing experience... Definitely coming back to Mostar and to Majdas!!
A really good hostel in the city centre. The living room/kitchen is a very good spot for meeting other travellers. They also inform you about tours around the city that are the best option for learning about what happen in the Yugoslavian war and the siege of Sarajevo.
A really nice hostel about five minutes from the city centre and 2min from the Kalemegdan. Really good living room and kitchen to meet the other travellers.
Neno is an amazing host. He helps you so that your stay as best as possible, giving advice as to what to see, where to eat, where to go at nights or any other question you have. The facilities of the hostel are enough for 10 people (maximum people on the hostel) and the location is great, 2min from the pile gate and between 2-5min from a couple of local beaches. Definitely coming back if I have a chance.