I spent 32 days in this apartment for studies and also for holidays. Everythings is fine, it's clean, and for longer stays it will be cleaned every week. The apartment is perfect for short stays, but if you stayed for five weeks as I did, there are some points you have to consider. First of all there is no proper desk to work. As a quick hack I used to go to the small coffee table and sit on the floor with my back laid to the glass room divider of the bedroom, same problem with the kitchenette. It's a fully equipped kitchen where you can prepare theoretically any food you like, but you don't have a place to sit and to enjoy your food. You can use the coffee table and have to sit on the floor or you can use one of the two plastic chairs, but the chairs are far too high for the low table, so you have to be aware of "hollow back".
Another thing to mention is the WiFi. The apartment has no real Wifi, it just has a router with a SIM Card and it's very, very slow (About 8 Mb/s), so you can't use it for Netflix. It's not very useful for the purposes I intended for my studies, etc.!
The data plan was part of my rent, but If you run out of data, and if you needed additional data, you would have to discuss that with the landlord.

The apartment itself is protected by guards 24 hours a day, and is located in the city center. So the apartment itself is safe, the surrounding area is also safe for tourists, in my perception. But you have to be aware of getting robbed, and you must be resilient against beggars that sometimes follow you to the entrance.
Conclusion: It's a small and smart apartment that 's perfect for a short stay, but I can't recommend it for a long stay. Therefore the owner has to fix the seating problem and have to install a real Wifi router with unlimited data and speed above the 8Mb/s.
Nevertheless, 5 Stars!