The big advantage of the place is its position. The Metro station "Diagonal" is just a jump away and if you want, you can easily walk to Plaza Catalunya, from where you can get everywhere you will ever need to go.
The apartment is modest and clean but it can feel a little crowded when you´re staying in one of the bigger rooms with others. The traffic noise especially during the night is quite challenging (room facing the street).
Conclusion: Its a good choice for young travellers who spend most of the day adventuring around in the city.