We were 6 people, and the flat is in 2 separate parts: 1 bedroom + 1 living room and bathroom, and on the other side of the house (need to walk outside to reach it) another bedroom (with own bathroom).
The living room is not huge, so if the weather is cold or bad (and you need to spend a lot of time inside), it might be a bit small. If the weather is good like we had, as Judith was very kind to let us enjoy the garden, the space is OK. The garden is really nice.
Judith is very reactive and flexible, it was really easy to organize our trip.
The Flat is near shops and the metro station (direct to the city center). Location is really good!