We lived in a room at the Batu for 4 days.
This is a good hostel option for those who need a separate room with a shower in the very center of the European part of Beyoglu. Nearby everything is within walking distance.
Batu was always in touch and was ready to solve any problem, which is valuable.
There are no questions about the number - the availability of towels, basic necessities + the air conditioner works fine, there is hot water, the Internet is fast.
The only point is noise insulation - it will not work for those who love silence. From the street, you can hear mopeds/cars passing by and plus housemates. But my husband and I were not scared, as we only ran in to spend the night.
In terms of price = quality, I recommend it for a short stay!