Really decent budget option, street-level access is a blessing.
I didn't have to use the metro system once during my stay, i hired a cheap one-gear bicycle and found most of Berlin's central attractions to be readily cyclable in less time than it'd take figuring out/waiting for public transport from this lodging. If you're staying for an event at the Estrel - it's no more than 5 minutes away by cycle.
The place was quite clean upon arrival & the check-in was refreshingly flexible.
Expect to pay around 45 Euro for an Uber to/from Tegel.