Choosing a furnished apartment in Madrid can reap a bevy of unexpected perks for travelers and residents alike. 

Firstly, there's the ease of mobility. With everything already set up, you can immediately feel at home without the hassle of moving and setting up furniture. This isn't just convenient; it's a real time-saver, especially for short-term stays or busy professionals.

Secondly, a furnished flat can offer a delightful taste of local culture. The furniture and decor often reflect the city's aesthetic and heritage. Instead of a generic living space, you're immersing yourself in a uniquely Madrid experience. 

Lastly, these apartments often come with services akin to those found in hotels. This can include cleaning services, maintenance, and even a concierge – amenities that go beyond just providing furniture. 

In conclusion, opting for a furnished apartment in Madrid delivers convenience, a local cultural immersion, and unexpected services that can make your stay far more enjoyable and hassle-free.