I've been there once in September 2014 already and have good memories only back to that time where we've met friends for tapas and enjoyed the citylife. I thought I will write a blog about it "mañana" - which means 1:1 translated tomorrow but the spanish meaning is somewhen in the future if ever :) And that's how it goes, I do it now, more focusing on the 2018 visit :)
What I remember from the last time 4 years ago was that we stayed at a really cool hotel, Roommate Oscar. In the area of Chueca including a rooftop pool which is a cool think as it is still very warm in September.
This time we stayed in an NH hotel a bit outside of the citycentre but easily accessible by bus (just took a while until I figured that out :) and the hotel was good too.
Madrid is a beautiful city and best is to discover it by yourself as everyone has his own interests on which you can focus then.
Recommendations I can share:
You probably know that I love delicious Food and Madrid has plenty of it - These are my hotspots:
We have also eaten at other places, mostly tapas and itt was everywhere delicious! You can't do much wrong I guess in Spain, Cava Baja for example is another famous tapas street which is common for spanish people to try some tapas and then move on to the next one for more drinks and other tapas.
I do also have a "secret list" from a local wtih more spots - if you're interested in, let me know, I am happy to send it to you :)