Overall we had a decent stay at Gem's apartment. The location ist great, the apartment is very well equipped and we loved the style of the interior design. It's also really clean- you can definitely have a good time here.
Biggest minus is the noise: the apartment is located directly above the historic cable car line, which is really noisy and windows aren's sound proof (bedrooms in the back, which helps). Some minor details you should know given the price: stairs up to the apartment are very steep, the floor in the 1st bedroom is slightly tilted and the 2nd bed is not too big.
Communication was okay, but a bit shaky because there is not a single contact person responsible for managing the check-ins and -outs.