The communication with Oliver prior to our stay was very clear by phone and messaging. Also for the check-in he was very flexible: we could arrive quite late in the evening.
The apartment was very nice and had everything you needed, however, it wasn't very clean. It smelled like someone had clearly smoked inside, something we didn't expect since the advertisement says smoking is not allowed. The garden was really big!
Also for the checkout Oliver was really flexible. After running the marathon of Berlin I was allowed to come back in the afternoon to take a shower, before finally leaving.
I would recomment staying at Oliver!