I don’t have all the information and answers however at your age I think to get a solid offer so fast for man to come to Moscow is very good for you! You need to ask where you both will be staying maybe a better idea to get an apartment than a hotel 2 bedroom apartment! you can then see how you cook for each other go out together and have choice of separate room or room together depending on time together, chemistry and dynamic don’t destroy this and make a choice you both feel comfortable with where you have options, both if it goes right or wrong! Mainly communication is key!