I stayed at Evrim place almost a month and it has been quite convenient place, very well located, pretty close to Istiklal and Galata but, in a quiet street so there was not much noise something common in this part of the city.
The appartment has stuff that will allow you to cook and not to depend only on restaurants (currently only take away services) that resulted useful with the recently imposed restrictions...few extra stuff (salt, sugar) for cooking will be appreciated to have as a basics for those medium term stays.
Evrim was really nice and helpful, it's positive having a person in the reception willing to help you at any moment in case of need. Other advantages, cleaning services in a daily basis and the possibility to use a laundry and dryer machine.