The apartment is modern and spacious! It’s well appointed and has AC which in the summer is essential in Florence! It’s located by the porta San frediano, which is still in the city but a bit far away of the main tourist attractions. If you like to walk, it shouldn’t be a problem.
I recommend keeping the windows closed because mosquitoes are prevalent (close to the Arno) so use the mosquito repellent/insecticide 3 hours or so before bedtime if you opened windows.
All in all, super convenient and modern. The host is very responsive and is accommodating, however, he relies on others to take care of the property so it might have some hiccups along the way. I would give it a solid B+.