We stayed in the apartment for 1.5 months with our son (less than a year old). Marco provided a baby bed and a baby chair for a small extra charge. We had a great stay in the apartment. The kitchen worked fine for simple cooking (a few extra glasses would have been fine) and in general everything worked as it should. The location is great if you like living in a less touristed area; there are plenty of shops, cafés, parks, bakeries etc to enjoy. And the metro takes you to your favorite attraction in a moment.
We would recommend the apartment for either shorter or longer stays. Marco was easy to communicate with, which made check-in, arrangement of baby-equipment etc. super easy. Though, we found the price a little high compared to other apartments, since the standard of furniture and kitchen utensils was not as good as expected with the price.