Kosta's place was perfect, we stayed there for a month, it was cosy, central and had a great vibe, it was close to everything Retiro, Atocha, Sol and in a great neighborhood Las Letras, street was quiet at night with a lot of life just around the corner, great bars, resturants, museums, placas it had everything.
Kosta was a great host also, he was always available and responsive, and made us feel extremely welcome, Thanks Kosta!