TL/DR; Satisfied with my stay, would definitely come back and recommend to others.
Cosy and comfortable hostel with just what you need in terms of facilities and amenities. I stayed in a room with a double bed, toilet and shower.
The room was small – apart from the bed, a chair and a wall-mounted tv there was not room for much else – but unless you want to spend more time on your room than in town it's no downside at all.
The bed was comfortable and both shower and toilet were clean, as was the neatly made bed. Unfortunately the floor in the room was gravelly, which I noticed since I walk around barefoot in the mornings, and the windowsills were dusty. But at least the most important bits were clean.
The common room and kitchen were well-equipped and pleasant. The hostel had nice, free wi-fi. I both arrived and left outside office hours (they don't have 24-hour staffing) so I used their convenient system for picking up my room key even though no staff member was there. The staff I did meet were friendly and helpful.
Incredibly convenient location – five-minute walking distance from the main train and bus stations and easy walk into downtown Vilnius.