Renovated in 2017, Houston Towers Inn Downtown Museum District Med. Ctr NRG-Adults Only offers an outdoor pool, free WiFi in public areas, and conference space. If you decide to drive, there's free parking. Front-desk staff can help with luggage storage, and provide local restaurant recommendations. Other amenities at this adults-only guesthouse include a microwave in a common area, a library, and express check-out.