We came with our little 1.5 y/o kid, and had a wonderful experience. First and foremost, the hosts are wonderful. They made us feel at home. We had fresh muffins waiting for us, home made tomato sauce, pasta and everything we needed to cook. The kitchen is fully equipped - with lots of useful utensils. The space is very pleasant. You can dine and relax indoors, or outside in the spacious patio. The hosts brought a crib and extra sheets for our kid, who had a lot of fun running around and playing in the apartment and in the patio.
The location is in a nice neighborhood - not in the busy center, but a walking distance, or with easy transportation (tram, bus) to the main attractions. Right next to the building there's a gourmet grocery store, and a Carrefour around the corner. There are lots of restaurants in the area. We enjoyed in particular one very cool pub really close by.