This is a very nice flat in a less tourist-exploited part of central Paris. Situated on the fifth floor in a building just off a busy street, the flat lets in just the perfect amount of buzz and is quiet at night. It is equppied with good quality utilities, such as washing-machine and nespresso-machine.
While St Denis is less polished than neighbouring areas, I felt fully safe walking back to the flat on my own late at night, and would recommend it to other single travellers.