My personal experience at Mambo Tango wasn't very pleasant for the following reasons:
1- the neightbourhood where the hostel is located is a little bit creepy. When walking in the evening/night to the hostel I never felt so safe.
2- the hostel has many facilities: kitchen and a common room, but I personally found a lack of ventilation and cleaning in the bedroom and the toilet: the two most important places a lodging has to take care of.
3- The third reason is not their fault, but the small ventilation and the structure of the beds contributed to enhance it: the person that was sleeping in the lower matress of my bunk bed had a terrible smell that was tormenting my nose all night (nights) long. The smell was trapped in the upper area of the bunk bed where I was sleeping, since our beds were separeted only by a "grid structure". So, beacause the beds have this "closed nest" structure, again there was not enough ventilation.
On the other hand, the stuff of the hostel is very nice and avaible, at any time of day and night.