We stayed at this apartment for two weeks and it was both a very nice stay and a challenging one.
The positive:
David let us check in very early in the morning. This was a godsend after an 14 hours bus ride.
The apartment is super clean, homey and overall super nice.
We were also allowed access to the normally closed cleaning room because of our long stay which was a major plus.
The negative:
The apartment is situated above a bar/restaurant with outdoor area under the apartments bedroom windows. This means a lot of smoke from smoking comes in to the apartment. This wasn't ideal for my asthmatic sister.
The area is also very busy throughout the night with drunk people coming from the bars that are in the area. We woke up a lot of times with drunken people screaming out in the streets.
If you don't mind the negative parts then this is an apartment for you. There is some nice restaurants nearby, near the billa and in Karlin where there also is a metro station.