Just back from a 4 night stay here with my girlfriend and we had a great time. Apartment is approx. 10 minute walk to Republique metro station. It's actually a very handy metro station in that it has various lines going through it and so you have more chances in getting where you're going directly. On the way to the metro there's a lovely boulangerie :) In fact right outside the building that the apartment is in is a very nice small wine bar that does pizza.
Apartment itself is perfect for couples or singles staying. What an advantage it is to have a whole apartment to yourself during city breaks these days! Good size double bed bedroom with a balcony. Also an ensuite. It is small but I believe is getting renovated so that should make it even better. Open plan living room/kitchen is ideal and very nicely furnished and laid out. The balconies there give the apartment that edge over others. What a treat it is to have a coffee in the morning on the balcony looking out at the narrow streets and rooftops.
Would recommend here to anyone coming to the city for a number of days. Oh and almost forgot to say - the food in Paris was quite disappointing to us - it's almost all cafés that serve mainly pizza and burgers. We wanted those traditional french restaurants that felt homely and warm. And we found one, only 15 minute walk from the apartment, through the republique square where the metro entrances are all located - a place called de l'autre cóté, beside the ibis hotel. Order the rumpsteak "á point" . Thank me later.