Location is good, we could walk to 3 different stations/lines within 10 minutes. Lots of eateries around, including good churros shop, 2 great coffee shops and famous gelato place just downstairs.
The apartment is large and should be comfortable for 6 people. But it is old and in original condition. Bathrooms are quite grimy. One of the shower doors was missing a panel but the host sent someone in the next day to install a shower curtain. We stayed for 2 weeks, but no cleaning was provided and only one garbage bag, couple rolls of toilet paper and 2 sets of hotel toiletries provided (we were a group of 8). We had to purchase toiletries, toilet paper, laundry detergent etc.
You have to climb 4 flights of stairs to the apartment. And there is no air conditioner. I missed this point in the description.
Overall I did not have a comfortable stay and for the price, it rather fell below my expectations.