We thought that Katrin and Lambert's apartment was beautiful, but its unfortunate location made our stay less than pleasant. This was a true shame as the apartment itself was spacious, well equipped and clean. The apartment is surrounded by noisy and rude units. The next door unit leaves its door open and seems to have an endless stream of guests (it seems like they are friends with another nearby unit). We barely got any rest because there was constant noise, incessant knocking, loud talking, and so much smoking that we had to cram towels underneath the door jam. When that noise died down, Long Street would party until 4 a.m. (We stayed during a weekend). We were completely sleep deprived the whole stay.
For the place itself and the hosts' great hospitality, I'd give it a great rating. If you can handle smoking and constant noise, you might be ok here.