Making SQL Server Express LocalDB 2014 work with SQL Server 2014 Management Studio:

1. Install Microsoft (R) SQL Server Express LocalDB 2014 (I needed IE to download)
2. Open Command Prompt
3. Run

SqlLocalDB create newDB -s

4. Install Microsoft SQL Server 2014 Management Studio
5. Start it
6. In login view, write

to Server Name
7. In login view, go to Options >> Additional Connection Parameters and paste this there:

Server=(localdb)\MSSQLLocalDB;Integrated Security=true

8. Press Connect
9. It might work!

date: 04.12.2014 (that's in December)