Heidi is very welcoming with her emails. Her communication skills are excellent; she is very responsive.
This is the second time I've stayed in Heidi's apartment, and I love it, but not so much the area as it is so far out of central Paris, and far from the more interesting areas of Montmartre. But the Metro is close by.
Heidi's apartment is immaculately clean, and is larger than the photos indicate. There is also a BATH, which I loved. The bathroom is also bigger than the usual tiny Parisian bathrooms.