Nicola's appartment ist very well situated, just next to the Metro Ménilmontant and close to Rue Oberkampf where you will find lots of restaurants and bars.
I stayed in the appartment for two weeks and this was quite long for me. In the kitchen, there is only a little, high window and everything is quite narrow, so the only place to spend time is the sleeping room. But there, you can only sit on the bed (no couch, etc.) which is by the way quite hard (Futon), but if you put a second matress on it, it is ok. So, I didn't really love to spend time in the appartment.
Furthermore, the heating is a bit complicated. If you don't put it on the highest level, it doesn't work. So you have the choice between very hot and very cold. I also had problems with the WC (moving toilet bowl), but I told Nicola and he wants to buy a new one.
Nicola is a very friendly host. He is reliable and prepared my stay very well, there were even things in the fridge! He was always available when I had questions during my stay and asked for feedback at the end of the two weeks.