We stayed at Rel Life last weekend. We were very satisfate. This place is baby friendly - all for our 2 years old daugther was prepared - baby cot, baby-dinning chair, small bath, even brand new stroller! (so we didnt travel by plane with our)
Communication was great. Apartment was really clear. Place is d close to center - during our stay we didnt use public transport - we were only walking (except transfer to airport of course)
Street was noisy - but what to expect in street close to center?? We havent big problem with that. After whole day walking and exploring Istanbul we slept like our small daugher :-)
We had hot water when we wanted and heating start to heat immediately as we turn it.