We were 4 people and we had an amazing time in this apartment.
The apt was spotless all clean with the nice feeling to rest on the bed without a problem. The location is top since you are really close to everything, from good restaurant till good clubs. Inside the apt nothing is missing everything from knifes until plates are available.
I really recommend this apt and hope next time that we visit Berlin again this apt is available.

The only really small bad thing is the internet, is really slow but hopefully this was only that weekend.