such a lovely hotel! location amazing, right on the Rhine with lovely views! Staff were all friendly and welcoming! Nice relaxed atmosphere with great facilities. Beautiful food and drink, looking forward to going back already!

Great hotel that has very nice modern rooms over looking the Rhine. Room was well equipped, although somewhat annoyingly you had to pay for everything, including just watching basic tv or using internet. This turned a reasonably priced hotel into a slightly expensive evening. The dining room downstairs does some great food, which is good because unless you have a car it can be difficult to get to other options on the other side of the Rhine.

We stayed three nights at Diehl's and were favorably impressed by the room. It was one of their "comfort" level rooms created in a fairly recent renovation and very nice. Also on the plus side, there is ample parking (the parking lot at the front door is always packed; you have to know to dodge down a narrow drive to the almost-empty underground lot).

A major negative is location. The hotel is on the opposite side of the river from town, sandwiched between the Rhine and a steep hill. It is accessible only by car, there is no convenient public transport and you can't get anywhere else in Koblenz from Diehl's on foot. You can't visit the Stadtmitte for shopping or eating, and you can't get to the embarkation point for the popular Rhine cruises, without a car. If you don't have a car, or like us would prefer not to try to drive into a strange town and try to park, your only resort is to call a taxi. For a business traveller on expenses this is perhaps not a problem, but to the vacationer it is.

An irksome negative is the wireless internet, which costs €9 per day (ouch) and if you have two laptops as we do, make that 2x9. And after you've paid you have one of those intrusive and pointless sign-on firewalls to go through every time your laptop wakes from sleep. Many hotels in Germany offer free wi-fi; this is another case of Diehl's profiting from the business traveller on expenses, and not catering to the vacationer.

The staff here was always friendly and adequate in English however they sometimes seemed distracted and the restaurant staff were either badly organized or overworked, service was slow and apologetic.

We stayed here for a few nights as part of our trip to the Moesel and Rhine rivers. We left the room in perfect order. As we were checking out, we chatted with what appeared to be a manager and told him that we were proceeding to Mainz. After another week of travel in Germany, we returned to the US, only to find a letter from Diehls Hotel informing us that they have charged our Visa card 150 Euros for a broken TV. Their letter read, "Tv fall down we need a new one!"--that was the extent of their explanation. This is utter absurdity. We did not break that TV; we hardly even touched it, the reception was so awful (the tv was certainly not worth 150 euros). The hotel had our cell phone number and our email, and yet they did not try to contact us to ask us anything as would have been the decent thing to do; we were only an hour away by train. Indeed, the "receipt" they attached to their letter showed the time of 12:30 p.m., when we were still in Koblenz, waiting for a train at the station. So, within an hour of our having checked out, they came to some rash decision that a tv was broken and we were somehow responsible, even though they could have had no real evidence for this because when we left the room at 11:00 the tv was not broken. Had they had the decency to call us, they could have immediately discerned that we were not responsible for any damaged property, or we could have come back to the hotel and could have summoned the Polizei to investigate. Instead, they wrote to our home address in the States, when we would have no convenient way to challenge this serious charge. This is fundamentally unfair and unjust. It is criminal.
If you do stay here, evidently you need to bring a manager to do a walking tour of your room to protect your rights and your pocket book. Do not let them have a credit card number, because you don't know what absurd charge will show up.

The positive things I would have written about this hotel have been totally swept aside by this experience.
Here are the drawbacks I would have mentioned, even if they had not falsely charged us:
1) We picked this hotel in part because the reviews of the other highly rated hotel in Koblenz said that place was out of the way, but we found that Diehls was out of the way, too. Since we did not have a car, it cost us 8 euros every time we wanted to go into town.
2) A train runs on tracks only ten feet away from the hotel. We would walk out the door of our room into the corridor, and we could see the track bed through the windows only a few feet away. Beginning very early, it is not only the loud sound of the train that wakes you up, but the shaking of the bed.
3) Even though this hotel has been in the business for a long time, 3 of the staff that we asked were clueless about basic tourist information. They had no brochures about the boat schedule, even though docks for boat tours were close by (one guy vaguely pointed at the river); they provided a map of the city that highlighted their hotel, but they did not provide the much more helpful official city map that showed several walking tours and identified key sites; we asked about one of the most famous castles on the Moesel (Burg Eltz), and they were clueless--when they finally found some information on the web, they gave us directions that would have been a disaster, had we not paid the 8 euros to go back to town to the tourist information center.

In short, if you stay here: come with a car; have all the travel information you need because they won't give you any (not even the basics); pay with cash and not a credit card so they can't arbitrarily charge you extra; and have the manager tour your room with you upon departure and sign a contract saying "Alles ist in Ordung"--because this hotel should not be trusted.

We will contest this false charge. I'll keep TripAdvisor informed.

Note: Evidently this hotel is listed in TravelAdvisor under two different states in German, although the address is the same. I originally posted this review under the choice "Koblenz, Saxony"--which is the same hotel and has the same address and comes up at the right place on a map--but the review wasn't posted here under "Koblenz, Rhineland-Palatinate," along with the other reviews. So I have re-posted here, with a couple small additions.