Check in took a long time and was frustrating. However, it was due to miscommunication, so ideally it should not happen again.
The cons: The house is on the 7th floor and there is no elevator. The staircase and corridors are tiny, dusty and dark. Do not stay here if you have heavy luggage as you will have to carry it up. A large suitcase would probably scrape against the sides of the staircase. The house has no mirrors. The bathroom sink is impossibly tiny. The bedsheets on the bed were very old and had some tears in the corner.
The pros: The house itself is well equipped, there are lots of lights and kitchen was well stocked. The fittings look new. The shower is spacious. There are two fans in the house which make hot summer days feel fine. The sofabed is very comfortable. The view of the sacre coeur is beautiful, especially at night. Wifi worked fine. There is a metro station is nearby.