Maria’s flat is a great and very beautiful space, even more so than the pictures suggest. It was our home for 3 months and we loved every bit of it. The kitchen is super well equipped to cook anything you want (we made feasts at home), the bed is super comfortable and with both a big table and a desk there is plenty of space to work from home (which was our case), especially since a new fast Internet was installed during our stay! The shower pressure is also very strong with plenty of hot water. We stayed during the winter months and while it does get cold in the flat as there is no heating system (not uncommon in Barcelona flats!), it was not a major problem for us between the extra blankets provided and the AC-turned-heater which we used in the evenings without it triggering big energy bills.
The only potential downside is traffic noise from the street which is quite busy, and can be an issue if you’re a light sleeper - we had our ear plugs and were fine with it. Other than this, the location is mega convenient, next to plaça de España which has a big shopping center with plenty of supermarkets (mercadona and Veritas, an organic supermarket) and is a 5 mins walk to get the bus to the airport (about 20mins), and the main train station is a 15-20 mins walk away. The charming Joan Miro park next to the flat was also great for walks, and there are plenty of gyms and yoga studios on the doorstep!
Maria herself was super helpful and responsive. We would definitely recommend the flat to anyone who considers a short or a long stay!