Good:
1. Perfect location; within easy walking distance to most attractions.
2. Apartment size.
3. Apartment security (elaborate locking system for gate into street).
Bad:
1. The check-in process. A day or more before our arrival, we advised of the host the exact time of our expected arrival - this was accepted. As requested, we also notified her when we were 30 minutes away. However when we arrived, we had to wait in the street with our luggage for a few minutes before someone arrived to unlock the apartment. This was not the end of it: when we entered the apartment, we found a cleaning lady inside who was still busy cleaning the apartment. We were told to leave immediately and only return again at 15h00. When I arrived back at 15h00, the cleaning lady was still busy and I left again. At around 15h15 I entered again, whereupon the cleaning lady (and host?) eventually left.
2. The electricity stability. When we woke early one morning, the electricity in the apartment was completely out, so cold showers (in winter), no internet, etc. The switches inside the apartment's distribution board all seemed fine, so I phoned the host who advised me of a further distribution box outside the apartment. I went there, found the tripped switch and flipped it back on. This process had to be repeated 2 further times during our 3 day stay.
3. Hand towels only. We were 5 adults who had to make do with 4 or 5 hand towels for the 3 day period. When I advised the host about it during our stay, she indicated that they did in fact have larger bath towels, which will be remembered next time... - I suspect they simply forgot to put this into the apartment during the changeover between guests.
4. Internet stability. We could not get internet reception throughout the apartment.