Hola Euroka! I always play tennis on saturday afternoons if it's not raining, there are some nice tennis clubs in Barcelona. at least 8.
I only play doubles, it's more fun and easier. I don't have time during weekdays. I could try to play from 7:30 am to 8:30 am but I am too sleepy. The problem here is that we don't have grass courts, only clay and hardcourts. for example the Catalan Tennis Federation has a new complex outside Barcelona, wonderful but there are 13 claycourts and 18 hardcourts. We don't have trees surroundings the tennis courts, one notable exception are courts 1-2 at RCTB, very popular, when with the shade it could be very tricky to see the ball.
the weather here is excellent, you can play outdoors during all the months, well, sometimes it's quite cold in january or february like 10ĒC but you are still able to play.
during the summer, the Aussie top juniors players come to the Catalan Federation tennis federation to practise on clay, it's very nice to talk with them. Also there are many chances to chat with retired pro players and active players. Sadly Ferrer practises all year in his home club in Valencia.