The location of the apartment is great. You can walk to pretty much everywhere. The unit is in the third floor but the stairs are not difficult (I also didn't have a luggage).
It's an old building as stated so be prepared to see what you could see in an old building. I didn't mind the noise as much, so I actually slept with AC off for a day or two. If the outside noise bothers you, you might need to consider sleeping with the AC on which also makes some noise but I personally don't mind the noise. If you respect and not occupy the bathroom too long sharing is definitely not an issue.
I love the decor. It's cosy, elegant and not overwhelming. The fully stocked cabinet for breakfast and snacks was a great treat. The room is definitely spacious and the bed was really comfortable. The host has great communication, check-in instructions were relayed well advance of arrival, you get exactly what you see in the listing.
And the cat... I might have became too friendly with her but it was nice to be greeted in the morning and evening with purrs and meows. :)