Juan Carlos and his friend Amparo were always quick to respond and did all that they could to make sure that my stay was great. short version - I had a great time and would stay again!
Location is very central - close to Gran Via and Callao Metro stations. 2 supermarkets nearby and loads of cafes, restaurants and bars. You can walk anywhere and you are really in the heart of the action. The apartment is a good size and has all the things that you need, making it very easy to feel at home. The shower unit is very big. The bed is hard but you get used to it very quickly. I slept well.
A few things to be aware of though:
1) You are in the centre of the action and bars close late, it can be noisy pretty much every night of the week.
2) The bins are collected every morning... early.
3) The internet was quite weak. I mentioned this to the host who tried to find a solution while I was there but it didn't work. They are aware that something needs to be done with that and so hopefully it will be. if you need to have a strong internet connection while staying I would advise that you check with the host before to see if a booster has been installed or some other remedy.
Thanks - have fun!