We first booked the smallest room with two twins and its similar to the two other smallest hotel rooms I've ever stayed in. Once also in Tokyo and once in London. These are those ultra tiny rooms where there's absolutely no floor space to open your luggage.

I was somewhat OK with the tiny room but my gf wasn't so we upgraded. It came out to an extra $95 USD/day but the larger room was like 2x larger and much better. I'd say do the tiny room if you're on a really tight budget, are traveling alone and only staying for a short trip - or if you plan on spending as little time in your room as possible.

Otherwise the hotel is pretty good. It's not a luxury 4-star hotel, but maybe something like an older Marriott. Totally fine and comfortable (once we got the bigger one). Only thing I wish they could control is the halls smell like carpet cleaner. It seems like they can't open the windows or properly circulate outside air so the cleaner smell just kinda sits.

The location is great if you're looking for a lot of action, energy, and night-life. There's a ton of restaurants nearby. Kabukicho is basically the red-light district and party area and unlike other parts of Tokyo, you will find trash on the streets, probably mostly from tourists or drunk locals that forgot their manners. Other parts of Shinjuku are right around the corner and tons of great restaurants there too.

We didn't try the breakfast. We thought we'd try it at least once but there's just too many food options in Tokyo. Btw, there's a place directly across the street with these dishes of grilled fish with rice and miso. This is a type of traditional japanese breakfast. That place is really good. Their most popular is a mackerel and second is the salmon belly, we tried both. Really good, but I liked the mackerel a bit better. I think it converted to like $7 USD.

There's no gym on site and I did a lot of eating. I overheard the hotel staff recommend a gym nearby, but I found a kickboxing gym a 10 minute walk away, look for "muay thai hostel" on google maps - yeah you can sleep there too. Its 4000Y per day to train but its really more like one-on-one with a trainer, so its very reasonable for that. Really nice guys, no experience necessary. Also, there's a coin laundry right next to them so you can wash your clothes while you train.

First time to stay at Shinjuku Prince. Great location for shopping, eating and accessing transportation. I returned my car rental in Odakyu Ace building which is about 10 min walk. I can walk to Shinjuku station for my meetings in less than 10 min. Upon my departure to airport, it's only few min walk to Airport Limousine bus at Tokyu Kabukicho Tower. My son enjoyed walking to Alpen Tokyo as he checked for new Nike model. We also went to have dinner in yakiniku place nearby. The only negative is the room size which is probably expected in any hotel in Tokyo.

I initially had a reservation at a different hotel that I felt was uncomfortable, and I found a deal at Shinjuku Prince instead. I was very pleased with my experience. I know the hotel was still renovating the lower floors, but I never experienced any inconvenience. Additionally, since the room I stayed in was remodeled this year (2024), It was all very mint.

Pros:
Centrally located in Shinjuku, it is attached to a train station.
The rooms are small but spotless, comfortable, and just renovated.
The view from the higher floor was superb.
The front desk staff and concierge stall were terrific, making it a smooth experience.
Housekeeping was attentive even though I never saw them (which is perfect)
Cons:
No Fitness Center
Summary: I highly recommend it and will likely stay there again. I recommend signing up for the rewards/loyalty program since it scored me a very late checkout.
As a solo guest, I couldn't have the traditional Japanese Afternoon Tea, which apparently was for two. This was a bummer since this is a travel tradition of mine.