Ich persönlich nutze für BTC-Käufe entweder https://localbitcoins.com oder Mycellium für lokale Trades. Sollte bei dir in München auch etwas mehr Angebot wie in Österreich geben.

Zwecks Bankeinzahlung bei Localbitcoins ist dies keinerlei Problem. Localbitcoins sperrt keinerlei deutsche oder österreichische Benutzer.

Zwecks Coinbase:
In den AGBs steht es eindeutig drin: COINBASE USER AGREEMENT
The websites and the services offered by Coinbase are NOT addressed to persons who have their registered office or place of residence in Germany. Coinbase services are provided by Coinbase UK, Ltd., a UK entity. Coinbase UK, Ltd. is not a regulated financial services provider and does not operate outside the UK.

This is a contract between you and Coinbase UK, Ltd, a private limited company incorporated in England and Wales ("Coinbase"). By signing up to use an account through coinbase.com or gdax.com, or any associated websites, APIs, or mobile applications (collectively the "Coinbase Site"), you agree that you have read, understood, and accept all of the terms and conditions contained in this Agreement, as well as our Privacy Policy and E-Sign Consent.

Du könntest hier also durchaus Probleme mit einem deutschen Bankkonto bekommen.