The location is excellent, close to amenities and the main highlights of the old city. The instructions were clear so we had few questions, but the staff in the café downstairs were friendly and approachable. The apartment has a bright, airy living room and a comfortable bed. It's an old building so don't expect modernity; the bathroom in particular has a certain vintage quality and is fairly cramped. The kitchen facilities are basic but adequate if you're only making breakfast and snacks, which is all you'll need, given the range of restaurants and cafes in the immediate locality. A sharp knife and some instructions for the microwave would help, though.
If location and convenience are more important to you than luxurious fittings, then we can recommend this apartment for a few days' visit to Antwerp.