The place is generally good, has a lot of pros and cons and I think that the final decision between 4 and 5 depends on if one is OK with basic places or not.
First of all - this place won't be comfortable for really tall guests, the ceilings are pretty low here (180cm in the kitchen is the lowest one). Other than that, again, it really depends on your position.
If you are OK with basic places or if you're just looking for somewhere to spend few nights - well, you will be totally pleased with this option. The price is very good for this neighborhood, the location is superb, the place itself has a comfortable bed, a kitchen, a bathroom, a fast and reliable WiFi - long story short, everything you might need. Yakup is a great host and reacts to any requests immediately. A lot of cats around, too =)
On the other hand, if you're looking for something more you may be disappointed with the lack of coziness and comfort here. The place itself is pretty tiny, it's pretty cold because of being located on the ground level (it may be an advantage for some or during the summer season; also, a heater is provided), and gloomy all the time. The tables are pretty small and only good for one, hot water runs out after 15 mins of taking shower, there are no plants and almost no decorations inside, there is a musty smell in the bedroom...
So yeah. You definitely can have a great time here if you're aware of all the nuances and are ready to ignore them. Otherwise, you'll be just good.