We spent four nights at Fran's apartment with our twin toddlers and warmly recommend the place, not exclusively but especially if you're travelling as a family.
In addition to being beautiful, the apartment is very comfortable, with living area, sleeping area and kitchen and guest bathroom separated enough to allow for children to sleep while adult life goes on. The place is very well equipped in general but there are some items for small children that are very hard to find elsewhere – a high chair, a seat for the bath, even a bottle brush – that made our life so much easier. And Fran even organised a second cot for us!
The only slight drawback we found was the street noise. The location is indeed very convenient and central, but it's also on a street with quite a lot of traffic. However, since the bedrooms open onto a glass-covered balcony, that didn't affect our sleep.