Pros: the location is superb - the apartment is located right where you need it to be; it is walking distance to all the touristy spots, restaurants and shopping. We only saw the need to take the train once - and that, only because it was raining. In addition, another positive point is that the apartment has a small kitchen that's convenient and relatively well-equipped. Check-in is easy and accommodating.
Cons: during a shower, the hot water ran out and we had to bathe in freezing water. The host was informed but had a very delayed response, which was thus unhelpful as it wasn't timely. The shower curtains were torn and not kept well. The bathroom sink was very badly clogged (water was not draining). In addition the pillows need to be changed - they are so thin they're almost non-existent, making for a not so comfortable sleep.
Overall, the main plus point is the location. That's really what you're getting.