Enes' apartment is great.
First, we loved the neighborhood: Balat is far from the chaos of the touristic neighborhood but still very well served by bus and tram (the stops are just few steps away - but remember to buy the transport card before getting on the bus)
Balat is an authentic and colorful neighborhood, with many nice bars just at walking distance from the apt where you can have breakfast in the morning. Also, lots of nice spots for photographs.
We stayed at the apartment with the rooftop terrace: view if astonishing, you can watch lovely dawns from there! please note that the apt is at the 4th floor with no elevator and several stairs to climb, in case you have some mobility issues. The apartment is small but functional, clean and provided with AC in the bedroom and kitchen equipment as well as a washing machine.
Enes, the host, is super kind, always replied within few minutes and he helped us a lot with our baggage which got lost at the airport.
To conclude, I highly recommend if you want to discover another neighborhood of Istanbul while still being able to reach the most touristic places there by transports!