If this guesthouse is in your price range, go for it! It is extremely well located, few minutes walk to the N-tower, myong dong streets and subway stations (exit 3 at myong dong station, take a left and walk up the street). The friendly staff will welcome you and even help you to book tours. The rooms are nothing extraordinary but have been recently renovated and extra clean! Breakfast is composed of noodles, bread and jam, very basic, but will help you get started for the day, and if that's not good enough for you, there are loads of coffee shops around, small eateries, restaurants and fast-foods.
Great hotel, great staff, great location, will definitely stay there again!