I stayed in Francesco's flat with my friend for 2 months. It was a great stay. We work remotely and we found the flat and the area well accommodated for our needs. Poble Sec neighborhood has everything for a great stay and it is a walking distance to everywhere, especially that we like to walk. Metro is also only 5 mins away from the flat and it takes you to any point in the city within 10-20 mins.
The flat has everything needed, there is a living room and a separate bedroom, nice balcony, well equipped kitchen, bathroom with shower and a wardrobe area where you an store all your stuff. In winter it can get a bit cold but Francesco allows to use AC and electric heater, so it was all good.
Francesco is a very nice person, very helpful and responsive, it was a pleasure to meet him.
I recommend this place 10/10.