This was great place to stay. Close to shops and cafes, the metro is at the door of the building, Gare St Lazare is about few mins walk away, and if you go the opposite direction there are three more metro lines about five mins walk. There is a a good supermarket around the corner, a very good cafe called Braun Notes a few mins walk in Rue Mogador where they do excellent flat whites - one of the few places in Paris that even knows about them.
If you are coming from Charles de Gaulle , catch the RER B to Gare du Nord, switch over to Magenta station on the RER E line (follow the signs carefully) and go just one stop to the end of the line - Haussman St Lazare. Very simple and it's just across the road from the building. Very easy.
We spent a whole month living there. The bed is a queen bed and it's very comfortable, the shower is good too, the bath is deep, and the bathroom is pleasant. There is even a good outlook from the living room instead of looking at the building next door, and from the balcony there is a view of Sacre Coeur.
Kitchen is adequate and there is a dishwasher. There is not a washing machine in the flat but there is one one off the hall which was fine for us. Highly recommend you get a live demonstration of getting the drier to work because it doesn't seem straightforward. We had a lot of trouble working it out until we found a way to get it going.
We had a few issues in the flat itself but the people at Glamaparis were responsive and the issues were worked out.
We would definitely stay there again. It was a great place to come back to at the end of the day.