If Erhan's place is available, don't think twice and book it - you will get the tremendous value! His apartment is big (there were 2 couples in our party), ideally located (close to the center/touristy places/public transport, but on a quiet and very safe street), but what was the most important for us - the personal touch. Erhan sent us a list of recommended restaurants/places to visit and it was amazing. We really felt that he shared the spots that locals go to and appreciated that.