Martina's apartment is very cozy and way more spacious as it seems on the photos. We were 2 young couples and had a great time there (with more than enough privacy since the living room with the sleeping couch and the bedroom are separated by the hallway). It is very clean and modern and easy to find. Also, it's located quite near to the castle and ideally near the tram stations for a very low price. Highly recommended :-)
The communication with Martina was perfect as well!