Hola supongo que sí claro

If you mean by safe against the virus. noting is safe,only if you are aware of your own behavior.peaple are using mask and when I was there only the airporttrain was disinfected,but maybe these days the skytrain as well. I think it is a good idea to ware plastic gloves and do not touch anything if not needed and do not touch your face as well,wash your hands and everywhere you will find handgel.

Yes very safe. At the moment just take normal precaution due to covid19. Face mask and hand sanitizer.

I am not sure about a card but yes you can buy single tickets

It's about 0.6 kilometer or 0.4 of a mile. Walk up Soi 18 to Sukhumvit road and turn left Site will not allow post of a google maps location, sorry. You are looking for BTS อโศก

Get a taxi rom the airport, it will save a lot of hassle and time. With BTS, you will have to change from the airport line to another. A taxi, subject to time of day, will go straight to your hotel door and cost around B300-B400.

Guten Tag, es gibt in Bangkok so viele verschiedene Fortbewegungsmittel, die alle zum Gesamtbild der Stadt gehören, vom Schiff bis zum Skytrain, also nicht nur auf diesen konzentrieren, sondern alle nutzen! Und generell gesehen: Transport in Bangkok ist preisgünstig. Viel Spaß!