The nearest metro station is Poblado, which is not really close to Estelar Blue. If you walk, it's about 15 - 20 minutes away. Going from the metro station to the hotel is uphill, so keep that in mind! However there are always taxis roaming around the station, which will take you to the hotel for about $1.5 - $2USD.
Get an answer from Hotel Estelar Blue staff and past guests.