30 years old guy, learning German, looking for accommodation in Berlin

Hi everyone! Recently, I have decieded to learn German... Which city better than Berlin? I'd like to share an apartment as a way to socialize there. I studied Economics in Spain but had the chance to live in Cardiff (UK) and Miami (US) for some months... I enjoy both going out and staying home. I like sports such as running, cycling, skating, hiking, skiing,... watching movies or tv shows as Shameless, Vikings, Game of Thrones, Matrix,... music (indie, mostly), photography, travelling,... Ah! love the japanese world. Anyway!¡! I wish to move in Berlin asap because I start German classes first week in February. Regards! ;)