Mona C.
Yelp
While known as a business hotel, Asia Center is very popular with foreigners. I believe the reasons are as follows:
1 - Accommodations are simple, yet comfortable and affordable. Most guests that stay here are on business trips or couples on vacation, but there were students from a Hawaii high-school on a study-abroad type stay.
2 - For guests with a foreign passport, a daily breakfast buffet is provided (both Japanese and American style foods available, with delicious fresh baked breads too!) in the restaurant found on the ground level of the hotel (Restaurant Fuji).
3 - Free water and amenities (in the form of toiletries) are available at the front desk.
4 - For English speaking guests, the front desk staff is fluent and can provide detailed directions to most places you wish to visit.
5 - The hotel is located just a few minutes (by walking) to the Aoyama-Itchome station, and a few stops from Roppongi and Mid-Town.
As of October 2015, the hotel had been remodeled, so I can only imagine that it is now better than ever!
Bonus:
What many do not know is that there are two rooms available for up to 4 people. We were fortunate enough to be traveling with a "regular/frequent guest to the hotel", and she got us hooked up with one of these rooms.
Rooms come with robes and slippers, and shampoo, conditioner and body wash are already provided in the shower.
Something different (for foreigners): a bidet!
If you are fortunate, you may even have a view of the Tokyo Tower from your room.