As a solo traveler, I had an enjoyable monthly stay in the apartment. It was clean and comfortable. The location is fantastic for exploring the city on foot. Very little street noise. As others have mentioned, be aware the narrow stairway is a struggle with large luggage.
My only real complaint was that I was only provided with 2 rolls of toilet paper and the single trash liner that was in the bin. When I requested more, I was told they would only be provided as part of an additional 70€ weekly cleaning. Also, the washing machine is very small and it is challenging to dry sheets and towels inside the apartment with the small rack provided. I hope they will make corrections for future longer stay guests.