The Good:
(1) Location. Very close to Gran Via. If you are walkers, you can walk to all the typical tourist areas in Madrid.
(2) The apartment is newly refurbished in an old building.
(3) Lots of restaurants in the area of the apartment. I would recommend the Chinese Restaurant called "El Tesoro" on Calle de Hortaleza. Good food, Good price, Good service.
(4) No problems with the inside temperature of the apartment in the cold of January. The heater works good and you do not need to use the heater much. The building itself was fairly warm in the cold of January.
(5) Self Check in. But you need to alert the apartment owner 30 minutes before you arrive at the building and when you arrive at the building. Then they will electronically let you in the building.
The Bad:
(1) No elevator in the building and the apartment is on the 4th floor.
(2) Gran Via Metro Station (closest station to the apartment) is closed for major repairs until ???
(3) There is one bed and one sofa bed. The bed is a little small for two people and we are short people. So for people with medium to large build, the bed could be a problem. The sofa bed is ok. But only one of us slept on the sofa bed ( we were 3 in the apartment).
(4) The bathroom door is difficult to close because either the floor by the bathroom is warped or the door itself is warped. When closing the bathroom door, lift up on the door handle and push the door shut. We sent a message to the apartment owner and they said they will fix it.
(5) Noise at night. We stayed on a Friday and Saturday night and there are people in the streets talking loudly most of the night. If your are a light sleeper, be prepared. Not sure how the noise is during the work week.