We spent 10 days as a family (2 adults and two kids). The apartment is very comfortable, spacious and furnished with everything we could have desired.
The position is clearly a key factor, close to the underground and other main public transport connections. To be fair the position is so central that we seldom used the public transport.
Sebastian proved to be a top notch host, offering us both a great apartment and support, even is everything was so perfect that we couldn't ask for more.
WIFI connection is very good and stable.
The markets are very close too.
We highly recommend Sebastian and his apartment.