I've visited Florence twice, and N7 Rooms is the accommodation I'd recommend most.
The location is ideal - just a short walk from the train station, which makes things so much easier if you're travelling around Italy on the train. It's still within easy walking distance of the city centre, but much quieter (I stayed by the Duomo on first visit, and it was quite noisy!!)
What really made our stay was Claudio, from the N7 Rooms team. His communication was excellent from the start - clear instructions, helpful messages before we arrived and great local recommendations. He made sure everything was smooth from check-in to check-out, even kindly looking after our bags on the last day.
The room itself was spacious, spotless, beautifully designed, and quiet. Exactly what we needed for a fleeting visit to Florence! Will definitely be back next time we're in Florence!