Bottom line: excellent place, highly recommend, wifi finicky, some noise during the day (duration of stay: 10 days)
This is THE place to stay if you want a quiet place with easy access to all of Berlin and to experience a vibrant neighborhood that is both lived in and loved. There are so many höfe (courtyards with shops) to explore - I was ecstatic to find Zadig, a French language bookstore, while returning from lunch one day - including great places for brunch.
This particular unit feels perfect for two people, tho may be a little small for three or four. At night it was completely silent (unless the window was ajar on the side with the balconies - which we learned one night) but in the day there was construction noise on the two or four days we spent in the unit working on personal projects. The short bursts of noise weren’t impossible to work through but you could hear it through out the entire building.
The Numa crew were extremely responsive and did what they could to address our problems.
Note: The biggest mark against this place is the internet service. To get connected, my husband and I would have to disconnect and reconnect our macs (I would use the Assist Me option and run through the diagnostics - several times during the day while working on my projects) anytime we stopped actively using the internet. We even lost connection during a video call home. Once the connection was made/restored, the internet was great but it was a real hassle figuring out why we couldn’t get it to work at first. We asked Numa for help with it and they were helpful but it was never completely resolved because we figured out how to make it work.
Side note: All of the tv stations were in German except two and there was no way to hook up an HDMI cable or screencast so we could watch what we want.
Even with those small problems, this place is definitely worth the stay. We highly recommend it and would certainly stay again!