It was an excellent experience to stay in Ariadna's art apartment. It's not that big but cozy enough and has a very nice location. It's near the metro station and a 24hr supermarket. Lavapiés is a lively charming neighborhood where is full of surprise and really worth exploring.
Ariadna and Reymer are great hosts. Reymer welcomed us with 2 glass of wine and gave us a brief introduction about the city. Though we never meet Ariadna, she gave us a lot of recommendations through internet as well.