The Underground Den, a mixed coworking space, boasts a perfect 5/5 rating on Google, supported by 8 verified reviews that attest to the quality of its offerings. Located at 52 Calle de Núñez de Balboa, this center provides flexible desks for 285 EUR/month and private enclosed offices accommodating up to 4 people for 1254 EUR/month. Its capacity ranges from 1 to 30 people, including meeting rooms available for rent at 17 EUR/hour, making it an adaptable solution for various needs. Amenities include high-speed Wi-Fi, air conditioning, 24/7 access, a reception desk, and complimentary coffee/tea, as well as a printer/scanner. The center stands out with its soundproof phone booths for confidential calls and numerous meeting rooms. Easily accessible, it is 309 meters from Núñez de Balboa station and a short walk from Goya impares (Esq. Castelló) and Velázquez stops, ensuring optimal connectivity in the Salamanca district. The verified review account, directly linked to this address, guarantees the authenticity of feedback. Its operating hours, Sunday to Thursday from 9:00 AM to 6:30 PM, accommodate various work schedules, offering great flexibility to its occupants.