Well, I would have put less than four stars in the first weeks (I stayed 15 for an internship).
Before I start, I will clarify how is the flat : it was formerly two symmetrical ones, but the middle wall was removed. It thus has two halves connected by a huge main TV-sofa-table room (a bit empty but that is just my opinion), each half having two rooms (so, four airbnb people in total) (the owner does not live here), a kitchen, a bathroom. One kitchen has the microwave and the dishwasher, the other have the oven and the laundry machine.
So, why was I (kind of) disappointed?
Mao is a nice person, but forgot to tell me before I was in front of the very flat's door that some work was ongoing. It went mostly during week-ends, but the real problem is that I spent two weeks without curtains (no shutters either and there won't be) in June, when the sun rises at 5:30. I was not really happy with that situation, but Mao did give me an eye mask.
About sleep, the bed was bad. The bed base does not have the right size, and annoying metal bars make noise whenever you hit them even slightly. The pillow was at first a tiny hard cushion that Mao eventually replaced by a big, mellow one. He noted the room dimensions to maybe get a bigger bed, too.
I saw him clean up rooms, bathrooms and kitchens each time a roommate left and another was expected, but even though he swore to have done it before my arrival, my half's kitchen and bathroom where frankly messy (to be fair, so was my roommate at the time, but to the point of getting there in a few hours?).
About the kitchenware : old and a bit mismatched but functionnal, although I do not advise you to use the pans (eggs attach, meat gets yellowish).
Even though the central room (not peoples' rooms) faces a great park, the building itself is between two important roads. Are Belgian sirens noisy; you will get used to hear a few each day. My point is, do not expect the outside to be quiet when you open the windows.
But you will need to in summer, as it can get hot. In the night, and even when opening windows for hours, it will be up to five degrees more in the rooms than on the kitchens side.
Since we are still in the criticizing part, I would add that tap water is drinkable but not really good. As far as I know it is the same for all Antwerp. There is a big sediment (chalk? limestone?) filter in the bathtub -whose shower head holder was still broken when I left, but at least the button to switch from tap to shower head have been fixed.
Still, I put four stars (if it was possible it would have been 3.5, but you get it, and I guess I am a harsh grader anyway) because Mao is of good will and currently doing some work on it. Sometimes unexpected (a roomba and a new floor for the balcony, for example) but I already saw improvements that made it better than when I first layed foot in.
It is hard to find a rental for a few monthes in Antwerp; this one has a lot of amenities (including: a guitar and a laundry machine), is near a Delhaize and a station with two lines going to the center each 10mn, and if you need to join Mao he will answer quite fast. He is often asking if anything is needed; maybe part of what I said above could have been fixed if I asked, but certainly not all.
So, in conclusion: a bit flawed, but take it if you can. You will see wonderful sunsets by the windows.