Joana was very helpful, she sent us all the information about travelling from the airport to the flat before our arriving, and even she collected some bike-rental flyers.
The flat is in the best location in Barcelona 15 minutes walk from the Sagrada Familia, Grácia is a really nice neighbourhood, where you can find everything, what you need (market, awesome bars and restaurants, where you can have some catalan tapas for example), but not full with tourists. From here you can reach quick everything in Barcelona on foot and by public transport too.
Our temporary home was a really safe place it has a metal rolling shutter, our stuff were in safe, while we walked in the city. We had everything, what we needed in the kitchen and in the bathroom, the place was really clean and comfortable.
We highly recommend this flat and thank you Joana everything!