Very functional and clean.
Communication with Stayery was strenuous – the bot sent messages offering human support. We reached out asking for a late checkout but needed to send follow-up messages since twice there was no response for >10 days. During the stay, they offer you communication via text messages, which worked somewhat better, but was still patchy. Overall, we got very mixed messages for the simple question 'Is a late checkout possible?' ranging from everything between should-be-possible and no-can-do. Eventually, they said it wasn't possible 15 minutes prior to the actual checkout time.
Apart from that, the location is great if you want to be in downtown Friedrichshain, rooms are clean and all the necessities one might need are available. There's also a co-working-space-style lobby where you can work, have a coffee, and buy snacks.