I stayed at Marta and Elena's for two weeks and it was very difficult to leave! The flat is cosy and very conveniently placed, either for holidays or for work (which was my case) since it is located very near to Quattro Venti station. It has everything one may need and more: the balcony is a very appreciable luxury!
Also, and most importantly, I don't think I have met hosts as welcoming as Elena and Marta, and their kindness definitely was a real highlight! Molto grazie, ancora!