There are many great things about this unit - the location is fantastic, the building is beautiful, the unit was clean and generally as described, and the staff responds quickly when contacted.
However, I unfortunately still cannot recommend this unit to almost anyone for one major reason: there is essentially no sound separation between it and the neighboring unit. All that separates them is a standard (emergency-exit-marked) door with no "seal" at the bottom, so you can hear anything from the other apartment as clearly as if it were coming from the next room in your house (and vice versa). Alarm clocks, the TV, normal-volume conversations - all were very audible. If your neighbors choose to fall asleep with the TV on, you're gonna be sleeping with the TV on too. If they set a 5 AM alarm, you're waking up at 5 AM as well. This would perhaps be reasonable for a hostel setting, but if you are advertising your place as an "entire apartment," it really shouldn't include this type of drawback that absolutely no one would put up with in their own apartment.
I must therefore reluctantly advise against booking this unit until when and if this issue is resolved, except under very specific circumstances (e.g. you also book Apartment 4, or you are deaf). If the host does resolve it, then I would change my advice entirely and heartily recommend it. I requested a refund over this issue (which was denied) and was told that this would be "addressed with ownership," so hopefully it will not be a problem forever.
(Also be sure to check the refrigerator's temperature setting - it does not give you any information on the actual temperature, but the coldest settings are cold enough to turn it into a freezer. I was unfortunate enough to have everything I put in it ruined because the previous guests had left it on "7.")