How to Arrive
The fastest and most advisable means of getting to the Drop Inn from Suvarnabhumi Airport (BKK) is through the Airport Rail Link (ARL) and MRT subway. Board the ARL City Line train from the airport terminal to Makkasan Station. At Makkasan, use the clearly marked skywalk connection to reach Phetchaburi MRT Station; it's just one stop over on the Blue Line to Sukhumvit Station, where a five-to-seven-minute walk leads up to this hotel. The whole trip takes little time for an extremely low fare with no traffic delays.
Taking a taxi or using Grab is also convenient particularly if you are that someone traveling with heavy luggage. It would take around 45 to 60 minutes for the trip from BKK airport, except during peak hours in Bangkok when traffic is monstrous and can sometimes stretch longer than expected. Have your hotel's address handy, written in Thai to show your driver. The fare will be higher compared to taking the train but it's a direct,
If coming from Don Mueang Airport (DMK), then the easiest way would be just to get a taxi or Grab directly to the hotel. More complicated public transport options from DMK. Strongly advised not to rent a car for stay in this part of Bangkok. Overwhelming traffic and zero private parking spaces at the hotel. Better way, city's excellent public transport, to get around.