My apartment is less than 15min walking to Sacré Coeur, Opéra or Grand Rex. Of course, if you prefer subway the closest station is at 3min walking, same for Vélib' (bycicle). It is very convenient to visit Paris.
My apartment is perfect for solo travellers, couples or business travellers.
There is a convertible sofa and an electric inflatable mattress for a third person if needed.