We stayed here for three nights and profited from the extremely central location of the apartment. It's in the Jewish quarter directly next to the Spanish synagogue in a nice, 100-year-old house. The main bedroom is quite cozy, but the second bedroom has no windows and it's difficult to get fresh air in, especially on a hot summer's day. Be aware that the flat is on the ground floor, so you will also get all the noise from the lively streets in.
Apart from that, we enjoyed our stay and the communication and check-in procedure was very easy and worked well.