Great location for travelers looking to party late in Taksim. The even numbered rooms (ex: 8) are not as noisy as the odd numbered ones due to facing different streets.
We stayed on both sides, but the odd numbered side was under construction so there were many mishaps (leaking ceiling, balcony door that doesn't close, etc.) Selim and his partner are both very accommodating and warned us ahead of time so there were no surprises. Once the construction end I believe both sides will be great choices.
I would not recommend this location for travelers who want to go to bed early. Once again, this place is best for travelers looking to party the night away in Taksim.