Travelling is very great experience, especially if you travel with friends. Here in Madrid is a lot of options to choose which transport to take. There are taxis, buses, undergrounds, trains, electric scooter. In Madrid in Barajas is big airport and from there you can take a underground or the bus to the city.
Underground system is very good organised. They drive very often from 5 am to 2 am. Arrival time between 2 undergrounds is between 2 to 10 minutes. The buses and trains drive less often. The train have less stations and its good for longer distances. For short distances is underground way better. In every station there is map of the city and they show us where which underground drive and where are the stations. Every underground have their own colour so its easier to find the right one. Driving with underground is very fast but the city is so big you have to change the underground line to get to the location you want. They are very fast but they have a lot of station. Its special because you travel but you cant see the city and if you miss the station you need to go back on the underground and travel back.