Isabel's place is close to Place Espanya (about 9 min walk). From the airport, you can also use the T-Casual tickets (11.35 for 10 uses) and take the RENFE train to Sants and then the bus to the flat and the stop is about 100m from the flat.
There are a lot of restaurants and shops nearby. You can also walk to the magic fountain without going down the hill.
The entrance is not well lit so at night, just be careful and make sure you are not on your own.
The kitchen in the flat is well equipped with a double bed and 2 single beds. There is a bathroom with a toilet and very nice shower. It is generally quiet at night. It was unusually cold but heaters were provided. There is also AC for when it gets hotter.
There is an ironing board, iron, and a clothes washing machine.
Whenever I sent Isabel a message, she replied promptly.
I highly recommend the place and would stay here again.